author | fparain |
Wed, 19 Feb 2014 16:22:15 +0000 | |
changeset 22891 | 1f5d1fff23fa |
parent 22528 | bd3821442010 |
child 22894 | 870fbe165d06 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#include "prims/jvm.h" |
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#include "runtime/frame.inline.hpp" |
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#include "runtime/interfaceSupport.hpp" |
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#include "runtime/os.hpp" |
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#include "utilities/vmError.hpp" |
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#include <unistd.h> |
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#include <sys/resource.h> |
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#include <sys/utsname.h> |
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#include <pthread.h> |
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#include <signal.h> |
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// Check core dump limit and report possible place where core can be found |
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void os::check_or_create_dump(void* exceptionRecord, void* contextRecord, char* buffer, size_t bufferSize) { |
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int n; |
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struct rlimit rlim; |
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bool success; |
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n = get_core_path(buffer, bufferSize); |
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if (getrlimit(RLIMIT_CORE, &rlim) != 0) { |
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jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (may not exist)", current_process_id()); |
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success = true; |
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} else { |
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switch(rlim.rlim_cur) { |
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case RLIM_INFINITY: |
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jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d", current_process_id()); |
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success = true; |
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break; |
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case 0: |
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jio_snprintf(buffer, bufferSize, "Core dumps have been disabled. To enable core dumping, try \"ulimit -c unlimited\" before starting Java again"); |
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success = false; |
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break; |
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default: |
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jio_snprintf(buffer + n, bufferSize - n, "/core or core.%d (max size %lu kB). To ensure a full core dump, try \"ulimit -c unlimited\" before starting Java again", current_process_id(), (unsigned long)(rlim.rlim_cur >> 10)); |
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success = true; |
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break; |
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} |
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} |
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VMError::report_coredump_status(buffer, success); |
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} |
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address os::get_caller_pc(int n) { |
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#ifdef _NMT_NOINLINE_ |
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n ++; |
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#endif |
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frame fr = os::current_frame(); |
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while (n > 0 && fr.pc() && |
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!os::is_first_C_frame(&fr) && fr.sender_pc()) { |
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fr = os::get_sender_for_C_frame(&fr); |
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n --; |
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} |
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if (n == 0) { |
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return fr.pc(); |
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} else { |
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return NULL; |
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} |
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} |
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int os::get_last_error() { |
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return errno; |
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} |
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bool os::is_debugger_attached() { |
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// not implemented |
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return false; |
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} |
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void os::wait_for_keypress_at_exit(void) { |
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// don't do anything on posix platforms |
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return; |
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} |
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// Multiple threads can race in this code, and can remap over each other with MAP_FIXED, |
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// so on posix, unmap the section at the start and at the end of the chunk that we mapped |
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// rather than unmapping and remapping the whole chunk to get requested alignment. |
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char* os::reserve_memory_aligned(size_t size, size_t alignment) { |
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assert((alignment & (os::vm_allocation_granularity() - 1)) == 0, |
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"Alignment must be a multiple of allocation granularity (page size)"); |
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assert((size & (alignment -1)) == 0, "size must be 'alignment' aligned"); |
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size_t extra_size = size + alignment; |
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assert(extra_size >= size, "overflow, size is too large to allow alignment"); |
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char* extra_base = os::reserve_memory(extra_size, NULL, alignment); |
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if (extra_base == NULL) { |
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return NULL; |
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} |
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// Do manual alignment |
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char* aligned_base = (char*) align_size_up((uintptr_t) extra_base, alignment); |
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// [ | | ] |
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// ^ extra_base |
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// ^ extra_base + begin_offset == aligned_base |
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// extra_base + begin_offset + size ^ |
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// extra_base + extra_size ^ |
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// |<>| == begin_offset |
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// end_offset == |<>| |
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size_t begin_offset = aligned_base - extra_base; |
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size_t end_offset = (extra_base + extra_size) - (aligned_base + size); |
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|
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if (begin_offset > 0) { |
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os::release_memory(extra_base, begin_offset); |
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} |
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|
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if (end_offset > 0) { |
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os::release_memory(extra_base + begin_offset + size, end_offset); |
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} |
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|
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return aligned_base; |
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} |
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void os::Posix::print_load_average(outputStream* st) { |
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st->print("load average:"); |
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double loadavg[3]; |
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os::loadavg(loadavg, 3); |
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st->print("%0.02f %0.02f %0.02f", loadavg[0], loadavg[1], loadavg[2]); |
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st->cr(); |
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} |
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void os::Posix::print_rlimit_info(outputStream* st) { |
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st->print("rlimit:"); |
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struct rlimit rlim; |
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st->print(" STACK "); |
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getrlimit(RLIMIT_STACK, &rlim); |
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if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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else st->print("%uk", rlim.rlim_cur >> 10); |
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st->print(", CORE "); |
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getrlimit(RLIMIT_CORE, &rlim); |
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if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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else st->print("%uk", rlim.rlim_cur >> 10); |
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//Isn't there on solaris |
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#ifndef TARGET_OS_FAMILY_solaris |
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st->print(", NPROC "); |
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getrlimit(RLIMIT_NPROC, &rlim); |
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if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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else st->print("%d", rlim.rlim_cur); |
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#endif |
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|
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st->print(", NOFILE "); |
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getrlimit(RLIMIT_NOFILE, &rlim); |
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if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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else st->print("%d", rlim.rlim_cur); |
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174 |
|
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st->print(", AS "); |
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getrlimit(RLIMIT_AS, &rlim); |
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if (rlim.rlim_cur == RLIM_INFINITY) st->print("infinity"); |
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else st->print("%uk", rlim.rlim_cur >> 10); |
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st->cr(); |
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180 |
} |
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181 |
|
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182 |
void os::Posix::print_uname_info(outputStream* st) { |
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183 |
// kernel |
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st->print("uname:"); |
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185 |
struct utsname name; |
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uname(&name); |
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st->print(name.sysname); st->print(" "); |
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188 |
st->print(name.release); st->print(" "); |
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st->print(name.version); st->print(" "); |
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190 |
st->print(name.machine); |
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191 |
st->cr(); |
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192 |
} |
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193 |
|
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bool os::has_allocatable_memory_limit(julong* limit) { |
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struct rlimit rlim; |
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int getrlimit_res = getrlimit(RLIMIT_AS, &rlim); |
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197 |
// if there was an error when calling getrlimit, assume that there is no limitation |
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// on virtual memory. |
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199 |
bool result; |
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if ((getrlimit_res != 0) || (rlim.rlim_cur == RLIM_INFINITY)) { |
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201 |
result = false; |
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202 |
} else { |
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*limit = (julong)rlim.rlim_cur; |
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result = true; |
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205 |
} |
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206 |
#ifdef _LP64 |
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207 |
return result; |
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208 |
#else |
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209 |
// arbitrary virtual space limit for 32 bit Unices found by testing. If |
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210 |
// getrlimit above returned a limit, bound it with this limit. Otherwise |
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211 |
// directly use it. |
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212 |
const julong max_virtual_limit = (julong)3800*M; |
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213 |
if (result) { |
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*limit = MIN2(*limit, max_virtual_limit); |
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215 |
} else { |
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216 |
*limit = max_virtual_limit; |
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217 |
} |
12735
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218 |
|
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219 |
// bound by actually allocatable memory. The algorithm uses two bounds, an |
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// upper and a lower limit. The upper limit is the current highest amount of |
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221 |
// memory that could not be allocated, the lower limit is the current highest |
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222 |
// amount of memory that could be allocated. |
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223 |
// The algorithm iteratively refines the result by halving the difference |
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224 |
// between these limits, updating either the upper limit (if that value could |
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225 |
// not be allocated) or the lower limit (if the that value could be allocated) |
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226 |
// until the difference between these limits is "small". |
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227 |
|
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228 |
// the minimum amount of memory we care about allocating. |
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229 |
const julong min_allocation_size = M; |
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230 |
|
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231 |
julong upper_limit = *limit; |
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232 |
|
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233 |
// first check a few trivial cases |
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234 |
if (is_allocatable(upper_limit) || (upper_limit <= min_allocation_size)) { |
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235 |
*limit = upper_limit; |
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236 |
} else if (!is_allocatable(min_allocation_size)) { |
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237 |
// we found that not even min_allocation_size is allocatable. Return it |
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238 |
// anyway. There is no point to search for a better value any more. |
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239 |
*limit = min_allocation_size; |
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240 |
} else { |
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241 |
// perform the binary search. |
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242 |
julong lower_limit = min_allocation_size; |
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243 |
while ((upper_limit - lower_limit) > min_allocation_size) { |
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244 |
julong temp_limit = ((upper_limit - lower_limit) / 2) + lower_limit; |
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245 |
temp_limit = align_size_down_(temp_limit, min_allocation_size); |
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246 |
if (is_allocatable(temp_limit)) { |
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247 |
lower_limit = temp_limit; |
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248 |
} else { |
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249 |
upper_limit = temp_limit; |
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250 |
} |
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251 |
} |
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252 |
*limit = lower_limit; |
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253 |
} |
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254 |
return true; |
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|
255 |
#endif |
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256 |
} |
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257 |
|
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258 |
const char* os::get_current_directory(char *buf, size_t buflen) { |
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259 |
return getcwd(buf, buflen); |
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260 |
} |
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261 |
|
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262 |
FILE* os::open(int fd, const char* mode) { |
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263 |
return ::fdopen(fd, mode); |
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264 |
} |
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|
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// Builds a platform dependent Agent_OnLoad_<lib_name> function name |
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267 |
// which is used to find statically linked in agents. |
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268 |
// Parameters: |
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269 |
// sym_name: Symbol in library we are looking for |
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270 |
// lib_name: Name of library to look in, NULL for shared libs. |
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271 |
// is_absolute_path == true if lib_name is absolute path to agent |
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272 |
// such as "/a/b/libL.so" |
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273 |
// == false if only the base name of the library is passed in |
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274 |
// such as "L" |
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275 |
char* os::build_agent_function_name(const char *sym_name, const char *lib_name, |
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276 |
bool is_absolute_path) { |
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277 |
char *agent_entry_name; |
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278 |
size_t len; |
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279 |
size_t name_len; |
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280 |
size_t prefix_len = strlen(JNI_LIB_PREFIX); |
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281 |
size_t suffix_len = strlen(JNI_LIB_SUFFIX); |
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282 |
const char *start; |
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283 |
|
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284 |
if (lib_name != NULL) { |
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285 |
len = name_len = strlen(lib_name); |
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286 |
if (is_absolute_path) { |
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287 |
// Need to strip path, prefix and suffix |
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288 |
if ((start = strrchr(lib_name, *os::file_separator())) != NULL) { |
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|
289 |
lib_name = ++start; |
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290 |
} |
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291 |
if (len <= (prefix_len + suffix_len)) { |
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|
292 |
return NULL; |
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293 |
} |
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|
294 |
lib_name += prefix_len; |
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295 |
name_len = strlen(lib_name) - suffix_len; |
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|
296 |
} |
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297 |
} |
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298 |
len = (lib_name != NULL ? name_len : 0) + strlen(sym_name) + 2; |
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299 |
agent_entry_name = NEW_C_HEAP_ARRAY_RETURN_NULL(char, len, mtThread); |
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|
300 |
if (agent_entry_name == NULL) { |
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|
301 |
return NULL; |
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|
302 |
} |
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|
303 |
strcpy(agent_entry_name, sym_name); |
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|
304 |
if (lib_name != NULL) { |
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|
305 |
strcat(agent_entry_name, "_"); |
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|
306 |
strncat(agent_entry_name, lib_name, name_len); |
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|
307 |
} |
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|
308 |
return agent_entry_name; |
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|
309 |
} |
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|
310 |
|
22891
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311 |
int os::sleep(Thread* thread, jlong millis, bool interruptible) { |
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312 |
assert(thread == Thread::current(), "thread consistency check"); |
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|
313 |
|
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314 |
ParkEvent * const slp = thread->_SleepEvent ; |
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315 |
slp->reset() ; |
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316 |
OrderAccess::fence() ; |
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|
317 |
|
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|
318 |
if (interruptible) { |
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319 |
jlong prevtime = javaTimeNanos(); |
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|
320 |
|
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|
321 |
for (;;) { |
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|
322 |
if (os::is_interrupted(thread, true)) { |
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|
323 |
return OS_INTRPT; |
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|
324 |
} |
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|
325 |
|
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|
326 |
jlong newtime = javaTimeNanos(); |
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changeset
|
327 |
|
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|
328 |
if (newtime - prevtime < 0) { |
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|
329 |
// time moving backwards, should only happen if no monotonic clock |
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|
330 |
// not a guarantee() because JVM should not abort on kernel/glibc bugs |
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|
331 |
assert(!os::supports_monotonic_clock(), "unexpected time moving backwards detected in os::sleep(interruptible)"); |
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|
332 |
} else { |
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|
333 |
millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
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|
334 |
} |
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changeset
|
335 |
|
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|
336 |
if (millis <= 0) { |
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|
337 |
return OS_OK; |
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changeset
|
338 |
} |
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changeset
|
339 |
|
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|
340 |
prevtime = newtime; |
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changeset
|
341 |
|
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|
342 |
{ |
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changeset
|
343 |
assert(thread->is_Java_thread(), "sanity check"); |
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|
344 |
JavaThread *jt = (JavaThread *) thread; |
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|
345 |
ThreadBlockInVM tbivm(jt); |
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|
346 |
OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */); |
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changeset
|
347 |
|
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|
348 |
jt->set_suspend_equivalent(); |
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|
349 |
// cleared by handle_special_suspend_equivalent_condition() or |
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|
350 |
// java_suspend_self() via check_and_wait_while_suspended() |
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changeset
|
351 |
|
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|
352 |
slp->park(millis); |
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changeset
|
353 |
|
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changeset
|
354 |
// were we externally suspended while we were waiting? |
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changeset
|
355 |
jt->check_and_wait_while_suspended(); |
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changeset
|
356 |
} |
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changeset
|
357 |
} |
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changeset
|
358 |
} else { |
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changeset
|
359 |
OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */); |
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changeset
|
360 |
jlong prevtime = javaTimeNanos(); |
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changeset
|
361 |
|
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changeset
|
362 |
for (;;) { |
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changeset
|
363 |
// It'd be nice to avoid the back-to-back javaTimeNanos() calls on |
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|
364 |
// the 1st iteration ... |
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changeset
|
365 |
jlong newtime = javaTimeNanos(); |
1f5d1fff23fa
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changeset
|
366 |
|
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changeset
|
367 |
if (newtime - prevtime < 0) { |
1f5d1fff23fa
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changeset
|
368 |
// time moving backwards, should only happen if no monotonic clock |
1f5d1fff23fa
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changeset
|
369 |
// not a guarantee() because JVM should not abort on kernel/glibc bugs |
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changeset
|
370 |
assert(!os::supports_monotonic_clock(), "unexpected time moving backwards detected on os::sleep(!interruptible)"); |
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changeset
|
371 |
} else { |
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changeset
|
372 |
millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC; |
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changeset
|
373 |
} |
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changeset
|
374 |
|
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changeset
|
375 |
if (millis <= 0) break ; |
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changeset
|
376 |
|
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changeset
|
377 |
prevtime = newtime; |
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changeset
|
378 |
slp->park(millis); |
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changeset
|
379 |
} |
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changeset
|
380 |
return OS_OK ; |
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changeset
|
381 |
} |
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changeset
|
382 |
} |
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changeset
|
383 |
|
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|
384 |
//////////////////////////////////////////////////////////////////////////////// |
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|
385 |
// interrupt support |
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changeset
|
386 |
|
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changeset
|
387 |
void os::interrupt(Thread* thread) { |
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changeset
|
388 |
assert(Thread::current() == thread || Threads_lock->owned_by_self(), |
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|
389 |
"possibility of dangling Thread pointer"); |
1f5d1fff23fa
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changeset
|
390 |
|
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changeset
|
391 |
OSThread* osthread = thread->osthread(); |
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changeset
|
392 |
|
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changeset
|
393 |
if (!osthread->interrupted()) { |
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changeset
|
394 |
osthread->set_interrupted(true); |
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changeset
|
395 |
// More than one thread can get here with the same value of osthread, |
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changeset
|
396 |
// resulting in multiple notifications. We do, however, want the store |
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changeset
|
397 |
// to interrupted() to be visible to other threads before we execute unpark(). |
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changeset
|
398 |
OrderAccess::fence(); |
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changeset
|
399 |
ParkEvent * const slp = thread->_SleepEvent ; |
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changeset
|
400 |
if (slp != NULL) slp->unpark() ; |
1f5d1fff23fa
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changeset
|
401 |
} |
1f5d1fff23fa
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changeset
|
402 |
|
1f5d1fff23fa
6546236: Thread interrupt() of Thread.sleep() can be lost on Solaris due to race with signal handler
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changeset
|
403 |
// For JSR166. Unpark even if interrupt status already was set |
1f5d1fff23fa
6546236: Thread interrupt() of Thread.sleep() can be lost on Solaris due to race with signal handler
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changeset
|
404 |
if (thread->is_Java_thread()) |
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|
405 |
((JavaThread*)thread)->parker()->unpark(); |
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|
406 |
|
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|
407 |
ParkEvent * ev = thread->_ParkEvent ; |
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|
408 |
if (ev != NULL) ev->unpark() ; |
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|
409 |
|
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|
410 |
} |
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|
411 |
|
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|
412 |
bool os::is_interrupted(Thread* thread, bool clear_interrupted) { |
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413 |
assert(Thread::current() == thread || Threads_lock->owned_by_self(), |
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|
414 |
"possibility of dangling Thread pointer"); |
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|
415 |
|
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|
416 |
OSThread* osthread = thread->osthread(); |
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|
417 |
|
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|
418 |
bool interrupted = osthread->interrupted(); |
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|
419 |
|
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|
420 |
// NOTE that since there is no "lock" around the interrupt and |
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|
421 |
// is_interrupted operations, there is the possibility that the |
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422 |
// interrupted flag (in osThread) will be "false" but that the |
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423 |
// low-level events will be in the signaled state. This is |
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424 |
// intentional. The effect of this is that Object.wait() and |
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|
425 |
// LockSupport.park() will appear to have a spurious wakeup, which |
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426 |
// is allowed and not harmful, and the possibility is so rare that |
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427 |
// it is not worth the added complexity to add yet another lock. |
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|
428 |
// For the sleep event an explicit reset is performed on entry |
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429 |
// to os::sleep, so there is no early return. It has also been |
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430 |
// recommended not to put the interrupted flag into the "event" |
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431 |
// structure because it hides the issue. |
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|
432 |
if (interrupted && clear_interrupted) { |
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433 |
osthread->set_interrupted(false); |
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434 |
// consider thread->_SleepEvent->reset() ... optional optimization |
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|
435 |
} |
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|
436 |
|
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437 |
return interrupted; |
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|
438 |
} |
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|
439 |
|
18943 | 440 |
os::WatcherThreadCrashProtection::WatcherThreadCrashProtection() { |
441 |
assert(Thread::current()->is_Watcher_thread(), "Must be WatcherThread"); |
|
442 |
} |
|
443 |
||
444 |
/* |
|
445 |
* See the caveats for this class in os_posix.hpp |
|
446 |
* Protects the callback call so that SIGSEGV / SIGBUS jumps back into this |
|
447 |
* method and returns false. If none of the signals are raised, returns true. |
|
448 |
* The callback is supposed to provide the method that should be protected. |
|
449 |
*/ |
|
450 |
bool os::WatcherThreadCrashProtection::call(os::CrashProtectionCallback& cb) { |
|
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|
451 |
sigset_t saved_sig_mask; |
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|
452 |
|
18943 | 453 |
assert(Thread::current()->is_Watcher_thread(), "Only for WatcherThread"); |
454 |
assert(!WatcherThread::watcher_thread()->has_crash_protection(), |
|
455 |
"crash_protection already set?"); |
|
456 |
||
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|
457 |
// we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask |
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|
458 |
// since on at least some systems (OS X) siglongjmp will restore the mask |
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|
459 |
// for the process, not the thread |
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|
460 |
pthread_sigmask(0, NULL, &saved_sig_mask); |
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|
461 |
if (sigsetjmp(_jmpbuf, 0) == 0) { |
18943 | 462 |
// make sure we can see in the signal handler that we have crash protection |
463 |
// installed |
|
464 |
WatcherThread::watcher_thread()->set_crash_protection(this); |
|
465 |
cb.call(); |
|
466 |
// and clear the crash protection |
|
467 |
WatcherThread::watcher_thread()->set_crash_protection(NULL); |
|
468 |
return true; |
|
469 |
} |
|
470 |
// this happens when we siglongjmp() back |
|
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|
471 |
pthread_sigmask(SIG_SETMASK, &saved_sig_mask, NULL); |
18943 | 472 |
WatcherThread::watcher_thread()->set_crash_protection(NULL); |
473 |
return false; |
|
474 |
} |
|
475 |
||
476 |
void os::WatcherThreadCrashProtection::restore() { |
|
477 |
assert(WatcherThread::watcher_thread()->has_crash_protection(), |
|
478 |
"must have crash protection"); |
|
479 |
||
480 |
siglongjmp(_jmpbuf, 1); |
|
481 |
} |
|
482 |
||
483 |
void os::WatcherThreadCrashProtection::check_crash_protection(int sig, |
|
484 |
Thread* thread) { |
|
485 |
||
486 |
if (thread != NULL && |
|
487 |
thread->is_Watcher_thread() && |
|
488 |
WatcherThread::watcher_thread()->has_crash_protection()) { |
|
489 |
||
490 |
if (sig == SIGSEGV || sig == SIGBUS) { |
|
491 |
WatcherThread::watcher_thread()->crash_protection()->restore(); |
|
492 |
} |
|
493 |
} |
|
494 |
} |