author | mbaesken |
Wed, 20 Nov 2019 14:16:29 +0100 | |
changeset 59197 | bb3472aa26c8 |
parent 53741 | 38b6110d5db2 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2001, 2019, 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. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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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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#include <assert.h> |
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#include <limits.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <sys/param.h> |
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#include <signal.h> |
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#include <pthread.h> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/select.h> |
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#include <sys/time.h> |
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#include <sys/resource.h> |
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#include <sys/uio.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <poll.h> |
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#include "jvm.h" |
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#include "net_util.h" |
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/* |
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* Stack allocated by thread when doing blocking operation |
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*/ |
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typedef struct threadEntry { |
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pthread_t thr; /* this thread */ |
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struct threadEntry *next; /* next thread */ |
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int intr; /* interrupted */ |
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} threadEntry_t; |
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/* |
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* Heap allocated during initialized - one entry per fd |
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*/ |
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typedef struct { |
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pthread_mutex_t lock; /* fd lock */ |
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threadEntry_t *threads; /* threads blocked on fd */ |
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} fdEntry_t; |
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/* |
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* Signal to unblock thread |
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*/ |
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static int sigWakeup = SIGIO; |
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/* |
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* fdTable holds one entry per file descriptor, up to a certain |
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* maximum. |
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* Theoretically, the number of possible file descriptors can get |
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* large, though usually it does not. Entries for small value file |
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* descriptors are kept in a simple table, which covers most scenarios. |
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* Entries for large value file descriptors are kept in an overflow |
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* table, which is organized as a sparse two dimensional array whose |
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* slabs are allocated on demand. This covers all corner cases while |
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* keeping memory consumption reasonable. |
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*/ |
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/* Base table for low value file descriptors */ |
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static fdEntry_t* fdTable = NULL; |
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/* Maximum size of base table (in number of entries). */ |
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static const int fdTableMaxSize = 0x1000; /* 4K */ |
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/* Actual size of base table (in number of entries) */ |
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static int fdTableLen = 0; |
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/* Max. theoretical number of file descriptors on system. */ |
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static int fdLimit = 0; |
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/* Overflow table, should base table not be large enough. Organized as |
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* an array of n slabs, each holding 64k entries. |
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*/ |
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static fdEntry_t** fdOverflowTable = NULL; |
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/* Number of slabs in the overflow table */ |
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static int fdOverflowTableLen = 0; |
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/* Number of entries in one slab */ |
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static const int fdOverflowTableSlabSize = 0x10000; /* 64k */ |
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pthread_mutex_t fdOverflowTableLock = PTHREAD_MUTEX_INITIALIZER; |
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/* |
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* Null signal handler |
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*/ |
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static void sig_wakeup(int sig) { |
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} |
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/* |
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* Initialization routine (executed when library is loaded) |
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* Allocate fd tables and sets up signal handler. |
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*/ |
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static void __attribute((constructor)) init() { |
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struct rlimit nbr_files; |
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sigset_t sigset; |
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struct sigaction sa; |
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int i = 0; |
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/* Determine the maximum number of possible file descriptors. */ |
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if (-1 == getrlimit(RLIMIT_NOFILE, &nbr_files)) { |
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fprintf(stderr, "library initialization failed - " |
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"unable to get max # of allocated fds\n"); |
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abort(); |
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} |
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if (nbr_files.rlim_max != RLIM_INFINITY) { |
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fdLimit = nbr_files.rlim_max; |
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} else { |
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/* We just do not know. */ |
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fdLimit = INT_MAX; |
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} |
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/* Allocate table for low value file descriptors. */ |
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fdTableLen = fdLimit < fdTableMaxSize ? fdLimit : fdTableMaxSize; |
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fdTable = (fdEntry_t*) calloc(fdTableLen, sizeof(fdEntry_t)); |
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if (fdTable == NULL) { |
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fprintf(stderr, "library initialization failed - " |
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"unable to allocate file descriptor table - out of memory"); |
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abort(); |
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} else { |
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for (i = 0; i < fdTableLen; i ++) { |
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pthread_mutex_init(&fdTable[i].lock, NULL); |
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} |
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} |
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/* Allocate overflow table, if needed */ |
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if (fdLimit > fdTableMaxSize) { |
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fdOverflowTableLen = ((fdLimit - fdTableMaxSize) / fdOverflowTableSlabSize) + 1; |
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fdOverflowTable = (fdEntry_t**) calloc(fdOverflowTableLen, sizeof(fdEntry_t*)); |
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if (fdOverflowTable == NULL) { |
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fprintf(stderr, "library initialization failed - " |
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"unable to allocate file descriptor overflow table - out of memory"); |
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abort(); |
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} |
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} |
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/* |
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* Setup the signal handler |
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*/ |
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sa.sa_handler = sig_wakeup; |
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sa.sa_flags = 0; |
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sigemptyset(&sa.sa_mask); |
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sigaction(sigWakeup, &sa, NULL); |
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sigemptyset(&sigset); |
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sigaddset(&sigset, sigWakeup); |
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sigprocmask(SIG_UNBLOCK, &sigset, NULL); |
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} |
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/* |
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* Return the fd table for this fd. |
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*/ |
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static inline fdEntry_t *getFdEntry(int fd) |
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{ |
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fdEntry_t* result = NULL; |
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if (fd < 0) { |
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return NULL; |
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} |
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/* This should not happen. If it does, our assumption about |
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* max. fd value was wrong. */ |
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assert(fd < fdLimit); |
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if (fd < fdTableMaxSize) { |
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/* fd is in base table. */ |
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assert(fd < fdTableLen); |
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result = &fdTable[fd]; |
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} else { |
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/* fd is in overflow table. */ |
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const int indexInOverflowTable = fd - fdTableMaxSize; |
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const int rootindex = indexInOverflowTable / fdOverflowTableSlabSize; |
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const int slabindex = indexInOverflowTable % fdOverflowTableSlabSize; |
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fdEntry_t* slab = NULL; |
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assert(rootindex < fdOverflowTableLen); |
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190 |
assert(slabindex < fdOverflowTableSlabSize); |
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191 |
pthread_mutex_lock(&fdOverflowTableLock); |
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192 |
/* Allocate new slab in overflow table if needed */ |
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193 |
if (fdOverflowTable[rootindex] == NULL) { |
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194 |
fdEntry_t* const newSlab = |
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195 |
(fdEntry_t*)calloc(fdOverflowTableSlabSize, sizeof(fdEntry_t)); |
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|
196 |
if (newSlab == NULL) { |
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|
197 |
fprintf(stderr, "Unable to allocate file descriptor overflow" |
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|
198 |
" table slab - out of memory"); |
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|
199 |
pthread_mutex_unlock(&fdOverflowTableLock); |
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|
200 |
abort(); |
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|
201 |
} else { |
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|
202 |
int i; |
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|
203 |
for (i = 0; i < fdOverflowTableSlabSize; i ++) { |
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|
204 |
pthread_mutex_init(&newSlab[i].lock, NULL); |
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|
205 |
} |
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|
206 |
fdOverflowTable[rootindex] = newSlab; |
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|
207 |
} |
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|
208 |
} |
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|
209 |
pthread_mutex_unlock(&fdOverflowTableLock); |
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|
210 |
slab = fdOverflowTable[rootindex]; |
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|
211 |
result = &slab[slabindex]; |
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|
212 |
} |
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|
213 |
|
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|
214 |
return result; |
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|
215 |
|
12047 | 216 |
} |
217 |
||
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|
218 |
|
12047 | 219 |
/* |
220 |
* Start a blocking operation :- |
|
221 |
* Insert thread onto thread list for the fd. |
|
222 |
*/ |
|
223 |
static inline void startOp(fdEntry_t *fdEntry, threadEntry_t *self) |
|
224 |
{ |
|
225 |
self->thr = pthread_self(); |
|
226 |
self->intr = 0; |
|
227 |
||
228 |
pthread_mutex_lock(&(fdEntry->lock)); |
|
229 |
{ |
|
230 |
self->next = fdEntry->threads; |
|
231 |
fdEntry->threads = self; |
|
232 |
} |
|
233 |
pthread_mutex_unlock(&(fdEntry->lock)); |
|
234 |
} |
|
235 |
||
236 |
/* |
|
237 |
* End a blocking operation :- |
|
238 |
* Remove thread from thread list for the fd |
|
239 |
* If fd has been interrupted then set errno to EBADF |
|
240 |
*/ |
|
241 |
static inline void endOp |
|
242 |
(fdEntry_t *fdEntry, threadEntry_t *self) |
|
243 |
{ |
|
244 |
int orig_errno = errno; |
|
245 |
pthread_mutex_lock(&(fdEntry->lock)); |
|
246 |
{ |
|
247 |
threadEntry_t *curr, *prev=NULL; |
|
248 |
curr = fdEntry->threads; |
|
249 |
while (curr != NULL) { |
|
250 |
if (curr == self) { |
|
251 |
if (curr->intr) { |
|
252 |
orig_errno = EBADF; |
|
253 |
} |
|
254 |
if (prev == NULL) { |
|
255 |
fdEntry->threads = curr->next; |
|
256 |
} else { |
|
257 |
prev->next = curr->next; |
|
258 |
} |
|
259 |
break; |
|
260 |
} |
|
261 |
prev = curr; |
|
262 |
curr = curr->next; |
|
263 |
} |
|
264 |
} |
|
265 |
pthread_mutex_unlock(&(fdEntry->lock)); |
|
266 |
errno = orig_errno; |
|
267 |
} |
|
268 |
||
269 |
/* |
|
270 |
* Close or dup2 a file descriptor ensuring that all threads blocked on |
|
271 |
* the file descriptor are notified via a wakeup signal. |
|
272 |
* |
|
273 |
* fd1 < 0 => close(fd2) |
|
274 |
* fd1 >= 0 => dup2(fd1, fd2) |
|
275 |
* |
|
276 |
* Returns -1 with errno set if operation fails. |
|
277 |
*/ |
|
278 |
static int closefd(int fd1, int fd2) { |
|
279 |
int rv, orig_errno; |
|
280 |
fdEntry_t *fdEntry = getFdEntry(fd2); |
|
281 |
if (fdEntry == NULL) { |
|
282 |
errno = EBADF; |
|
283 |
return -1; |
|
284 |
} |
|
285 |
||
286 |
/* |
|
287 |
* Lock the fd to hold-off additional I/O on this fd. |
|
288 |
*/ |
|
289 |
pthread_mutex_lock(&(fdEntry->lock)); |
|
290 |
||
291 |
{ |
|
292 |
/* |
|
293 |
* Send a wakeup signal to all threads blocked on this |
|
294 |
* file descriptor. |
|
295 |
*/ |
|
296 |
threadEntry_t *curr = fdEntry->threads; |
|
297 |
while (curr != NULL) { |
|
298 |
curr->intr = 1; |
|
299 |
pthread_kill( curr->thr, sigWakeup ); |
|
300 |
curr = curr->next; |
|
301 |
} |
|
302 |
||
303 |
/* |
|
304 |
* And close/dup the file descriptor |
|
305 |
* (restart if interrupted by signal) |
|
306 |
*/ |
|
307 |
do { |
|
308 |
if (fd1 < 0) { |
|
309 |
rv = close(fd2); |
|
310 |
} else { |
|
311 |
rv = dup2(fd1, fd2); |
|
312 |
} |
|
313 |
} while (rv == -1 && errno == EINTR); |
|
314 |
||
315 |
} |
|
316 |
||
317 |
/* |
|
318 |
* Unlock without destroying errno |
|
319 |
*/ |
|
320 |
orig_errno = errno; |
|
321 |
pthread_mutex_unlock(&(fdEntry->lock)); |
|
322 |
errno = orig_errno; |
|
323 |
||
324 |
return rv; |
|
325 |
} |
|
326 |
||
327 |
/* |
|
328 |
* Wrapper for dup2 - same semantics as dup2 system call except |
|
329 |
* that any threads blocked in an I/O system call on fd2 will be |
|
330 |
* preempted and return -1/EBADF; |
|
331 |
*/ |
|
332 |
int NET_Dup2(int fd, int fd2) { |
|
333 |
if (fd < 0) { |
|
334 |
errno = EBADF; |
|
335 |
return -1; |
|
336 |
} |
|
337 |
return closefd(fd, fd2); |
|
338 |
} |
|
339 |
||
340 |
/* |
|
341 |
* Wrapper for close - same semantics as close system call |
|
342 |
* except that any threads blocked in an I/O on fd will be |
|
343 |
* preempted and the I/O system call will return -1/EBADF. |
|
344 |
*/ |
|
345 |
int NET_SocketClose(int fd) { |
|
346 |
return closefd(-1, fd); |
|
347 |
} |
|
348 |
||
349 |
/************** Basic I/O operations here ***************/ |
|
350 |
||
351 |
/* |
|
352 |
* Macro to perform a blocking IO operation. Restarts |
|
353 |
* automatically if interrupted by signal (other than |
|
354 |
* our wakeup signal) |
|
355 |
*/ |
|
356 |
#define BLOCKING_IO_RETURN_INT(FD, FUNC) { \ |
|
357 |
int ret; \ |
|
358 |
threadEntry_t self; \ |
|
359 |
fdEntry_t *fdEntry = getFdEntry(FD); \ |
|
360 |
if (fdEntry == NULL) { \ |
|
361 |
errno = EBADF; \ |
|
362 |
return -1; \ |
|
363 |
} \ |
|
364 |
do { \ |
|
365 |
startOp(fdEntry, &self); \ |
|
366 |
ret = FUNC; \ |
|
367 |
endOp(fdEntry, &self); \ |
|
368 |
} while (ret == -1 && errno == EINTR); \ |
|
369 |
return ret; \ |
|
370 |
} |
|
371 |
||
372 |
int NET_Read(int s, void* buf, size_t len) { |
|
373 |
BLOCKING_IO_RETURN_INT( s, recv(s, buf, len, 0) ); |
|
374 |
} |
|
375 |
||
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376 |
int NET_NonBlockingRead(int s, void* buf, size_t len) { |
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|
377 |
BLOCKING_IO_RETURN_INT( s, recv(s, buf, len, MSG_DONTWAIT)); |
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|
378 |
} |
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|
379 |
|
12047 | 380 |
int NET_RecvFrom(int s, void *buf, int len, unsigned int flags, |
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|
381 |
struct sockaddr *from, socklen_t *fromlen) { |
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|
382 |
BLOCKING_IO_RETURN_INT( s, recvfrom(s, buf, len, flags, from, fromlen) ); |
12047 | 383 |
} |
384 |
||
385 |
int NET_Send(int s, void *msg, int len, unsigned int flags) { |
|
386 |
BLOCKING_IO_RETURN_INT( s, send(s, msg, len, flags) ); |
|
387 |
} |
|
388 |
||
389 |
int NET_SendTo(int s, const void *msg, int len, unsigned int |
|
390 |
flags, const struct sockaddr *to, int tolen) { |
|
391 |
BLOCKING_IO_RETURN_INT( s, sendto(s, msg, len, flags, to, tolen) ); |
|
392 |
} |
|
393 |
||
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|
394 |
int NET_Accept(int s, struct sockaddr *addr, socklen_t *addrlen) { |
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|
395 |
BLOCKING_IO_RETURN_INT( s, accept(s, addr, addrlen) ); |
12047 | 396 |
} |
397 |
||
398 |
int NET_Connect(int s, struct sockaddr *addr, int addrlen) { |
|
399 |
BLOCKING_IO_RETURN_INT( s, connect(s, addr, addrlen) ); |
|
400 |
} |
|
401 |
||
402 |
int NET_Poll(struct pollfd *ufds, unsigned int nfds, int timeout) { |
|
403 |
BLOCKING_IO_RETURN_INT( ufds[0].fd, poll(ufds, nfds, timeout) ); |
|
404 |
} |
|
405 |
||
406 |
/* |
|
407 |
* Wrapper for select(s, timeout). We are using select() on Mac OS due to Bug 7131399. |
|
408 |
* Auto restarts with adjusted timeout if interrupted by |
|
409 |
* signal other than our wakeup signal. |
|
410 |
*/ |
|
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|
411 |
int NET_Timeout(JNIEnv *env, int s, long timeout, jlong nanoTimeStamp) { |
12047 | 412 |
struct timeval t, *tp = &t; |
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|
413 |
fd_set fds; |
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|
414 |
fd_set* fdsp = NULL; |
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|
415 |
int allocated = 0; |
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|
416 |
threadEntry_t self; |
12047 | 417 |
fdEntry_t *fdEntry = getFdEntry(s); |
418 |
||
419 |
/* |
|
420 |
* Check that fd hasn't been closed. |
|
421 |
*/ |
|
422 |
if (fdEntry == NULL) { |
|
423 |
errno = EBADF; |
|
424 |
return -1; |
|
425 |
} |
|
426 |
||
427 |
/* |
|
428 |
* Pick up current time as may need to adjust timeout |
|
429 |
*/ |
|
430 |
if (timeout > 0) { |
|
431 |
/* Timed */ |
|
432 |
t.tv_sec = timeout / 1000; |
|
433 |
t.tv_usec = (timeout % 1000) * 1000; |
|
434 |
} else if (timeout < 0) { |
|
435 |
/* Blocking */ |
|
436 |
tp = 0; |
|
437 |
} else { |
|
438 |
/* Poll */ |
|
439 |
t.tv_sec = 0; |
|
440 |
t.tv_usec = 0; |
|
441 |
} |
|
442 |
||
23043
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|
443 |
if (s < FD_SETSIZE) { |
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|
444 |
fdsp = &fds; |
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|
445 |
FD_ZERO(fdsp); |
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|
446 |
} else { |
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|
447 |
int length = (howmany(s+1, NFDBITS)) * sizeof(int); |
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|
448 |
fdsp = (fd_set *) calloc(1, length); |
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|
449 |
if (fdsp == NULL) { |
23048 | 450 |
return -1; // errno will be set to ENOMEM |
23043
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|
451 |
} |
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|
452 |
allocated = 1; |
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|
453 |
} |
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|
454 |
FD_SET(s, fdsp); |
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|
455 |
|
45061
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changeset
|
456 |
jlong prevNanoTime = nanoTimeStamp; |
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|
457 |
jlong nanoTimeout = (jlong) timeout * NET_NSEC_PER_MSEC; |
12047 | 458 |
for(;;) { |
459 |
int rv; |
|
460 |
||
461 |
/* |
|
462 |
* call select on the fd. If interrupted by our wakeup signal |
|
463 |
* errno will be set to EBADF. |
|
464 |
*/ |
|
465 |
||
466 |
startOp(fdEntry, &self); |
|
23043
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changeset
|
467 |
rv = select(s+1, fdsp, 0, 0, tp); |
12047 | 468 |
endOp(fdEntry, &self); |
469 |
||
470 |
/* |
|
471 |
* If interrupted then adjust timeout. If timeout |
|
472 |
* has expired return 0 (indicating timeout expired). |
|
473 |
*/ |
|
474 |
if (rv < 0 && errno == EINTR) { |
|
45061
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changeset
|
475 |
jlong newNanoTime = JVM_NanoTime(env, 0); |
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changeset
|
476 |
nanoTimeout -= newNanoTime - prevNanoTime; |
74b09ee3cd55
8179905: Remove the use of gettimeofday in Networking code
vtewari
parents:
44921
diff
changeset
|
477 |
if (nanoTimeout < NET_NSEC_PER_MSEC) { |
74b09ee3cd55
8179905: Remove the use of gettimeofday in Networking code
vtewari
parents:
44921
diff
changeset
|
478 |
if (allocated != 0) |
74b09ee3cd55
8179905: Remove the use of gettimeofday in Networking code
vtewari
parents:
44921
diff
changeset
|
479 |
free(fdsp); |
74b09ee3cd55
8179905: Remove the use of gettimeofday in Networking code
vtewari
parents:
44921
diff
changeset
|
480 |
return 0; |
12047 | 481 |
} |
45061
74b09ee3cd55
8179905: Remove the use of gettimeofday in Networking code
vtewari
parents:
44921
diff
changeset
|
482 |
prevNanoTime = newNanoTime; |
74b09ee3cd55
8179905: Remove the use of gettimeofday in Networking code
vtewari
parents:
44921
diff
changeset
|
483 |
t.tv_sec = nanoTimeout / NET_NSEC_PER_SEC; |
74b09ee3cd55
8179905: Remove the use of gettimeofday in Networking code
vtewari
parents:
44921
diff
changeset
|
484 |
t.tv_usec = (nanoTimeout % NET_NSEC_PER_SEC) / NET_NSEC_PER_USEC; |
74b09ee3cd55
8179905: Remove the use of gettimeofday in Networking code
vtewari
parents:
44921
diff
changeset
|
485 |
|
12047 | 486 |
} else { |
23043
15face72cb3b
8035897: Better memory allocation for file descriptors greater than 1024 on macosx
chegar
parents:
23033
diff
changeset
|
487 |
if (allocated != 0) |
15face72cb3b
8035897: Better memory allocation for file descriptors greater than 1024 on macosx
chegar
parents:
23033
diff
changeset
|
488 |
free(fdsp); |
12047 | 489 |
return rv; |
490 |
} |
|
491 |
} |
|
492 |
} |