--- a/jdk/src/java.base/aix/native/libnet/java/net/aix_close.c Wed Jan 28 16:45:33 2015 -0800
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,491 +0,0 @@
-/*
- * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-/*
- * This file contains implementations of NET_... functions. The NET_.. functions are
- * wrappers for common file- and socket functions plus provisions for non-blocking IO.
- *
- * (basically, the layers remember all file descriptors waiting for a particular fd;
- * all threads waiting on a certain fd can be woken up by sending them a signal; this
- * is done e.g. when the fd is closed.)
- *
- * This was originally copied from the linux_close.c implementation.
- *
- * Side Note: This coding needs initialization. Under Linux this is done
- * automatically via __attribute((constructor)), on AIX this is done manually
- * (see aix_close_init).
- *
- */
-
-/*
- AIX needs a workaround for I/O cancellation, see:
- http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.basetechref/doc/basetrf1/close.htm
- ...
- The close subroutine is blocked until all subroutines which use the file
- descriptor return to usr space. For example, when a thread is calling close
- and another thread is calling select with the same file descriptor, the
- close subroutine does not return until the select call returns.
- ...
-*/
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <signal.h>
-#include <pthread.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/time.h>
-#include <sys/resource.h>
-#include <sys/uio.h>
-#include <unistd.h>
-#include <errno.h>
-#include <sys/poll.h>
-
-/*
- * Stack allocated by thread when doing blocking operation
- */
-typedef struct threadEntry {
- pthread_t thr; /* this thread */
- struct threadEntry *next; /* next thread */
- int intr; /* interrupted */
-} threadEntry_t;
-
-/*
- * Heap allocated during initialized - one entry per fd
- */
-typedef struct {
- pthread_mutex_t lock; /* fd lock */
- threadEntry_t *threads; /* threads blocked on fd */
-} fdEntry_t;
-
-/*
- * Signal to unblock thread
- */
-static int sigWakeup = (SIGRTMAX - 1);
-
-/*
- * The fd table and the number of file descriptors
- */
-static fdEntry_t *fdTable = NULL;
-static int fdCount = 0;
-
-/*
- * Null signal handler
- */
-static void sig_wakeup(int sig) {
-}
-
-/*
- * Initialization routine (executed when library is loaded)
- * Allocate fd tables and sets up signal handler.
- *
- * On AIX we don't have __attribute((constructor)) so we need to initialize
- * manually (from JNI_OnLoad() in 'src/share/native/java/net/net_util.c')
- */
-void aix_close_init() {
- struct rlimit nbr_files;
- sigset_t sigset;
- struct sigaction sa;
-
- /* Check already initialized */
- if (fdCount > 0 && fdTable != NULL) {
- return;
- }
-
- /*
- * Allocate table based on the maximum number of
- * file descriptors.
- */
- if (-1 == getrlimit(RLIMIT_NOFILE, &nbr_files)) {
- fprintf(stderr, "library initialization failed - "
- "unable to get max # of allocated fds\n");
- abort();
- }
- fdCount = nbr_files.rlim_max;
- /*
- * We have a conceptual problem here, when the number of files is
- * unlimited. As a kind of workaround, we ensure the table is big
- * enough for handle even a large number of files. Since SAP itself
- * recommends a limit of 32000 files, we just use 64000 as 'infinity'.
- */
- if (nbr_files.rlim_max == RLIM_INFINITY) {
- fdCount = 64000;
- }
- fdTable = (fdEntry_t *)calloc(fdCount, sizeof(fdEntry_t));
- if (fdTable == NULL) {
- fprintf(stderr, "library initialization failed - "
- "unable to allocate file descriptor table - out of memory");
- abort();
- }
-
- {
- int i;
- for (i=0; i < fdCount; i++) {
- pthread_mutex_init(&fdTable[i].lock, NULL);
- }
- }
-
- /*
- * Setup the signal handler
- */
- sa.sa_handler = sig_wakeup;
- sa.sa_flags = 0;
- sigemptyset(&sa.sa_mask);
- sigaction(sigWakeup, &sa, NULL);
-
- sigemptyset(&sigset);
- sigaddset(&sigset, sigWakeup);
- sigprocmask(SIG_UNBLOCK, &sigset, NULL);
-}
-
-/*
- * Return the fd table for this fd or NULL is fd out
- * of range.
- */
-static inline fdEntry_t *getFdEntry(int fd)
-{
- if (fd < 0 || fd >= fdCount) {
- return NULL;
- }
- return &fdTable[fd];
-}
-
-/*
- * Start a blocking operation :-
- * Insert thread onto thread list for the fd.
- */
-static inline void startOp(fdEntry_t *fdEntry, threadEntry_t *self)
-{
- self->thr = pthread_self();
- self->intr = 0;
-
- pthread_mutex_lock(&(fdEntry->lock));
- {
- self->next = fdEntry->threads;
- fdEntry->threads = self;
- }
- pthread_mutex_unlock(&(fdEntry->lock));
-}
-
-/*
- * End a blocking operation :-
- * Remove thread from thread list for the fd
- * If fd has been interrupted then set errno to EBADF
- */
-static inline void endOp
- (fdEntry_t *fdEntry, threadEntry_t *self)
-{
- int orig_errno = errno;
- pthread_mutex_lock(&(fdEntry->lock));
- {
- threadEntry_t *curr, *prev=NULL;
- curr = fdEntry->threads;
- while (curr != NULL) {
- if (curr == self) {
- if (curr->intr) {
- orig_errno = EBADF;
- }
- if (prev == NULL) {
- fdEntry->threads = curr->next;
- } else {
- prev->next = curr->next;
- }
- break;
- }
- prev = curr;
- curr = curr->next;
- }
- }
- pthread_mutex_unlock(&(fdEntry->lock));
- errno = orig_errno;
-}
-
-/*
- * Close or dup2 a file descriptor ensuring that all threads blocked on
- * the file descriptor are notified via a wakeup signal.
- *
- * fd1 < 0 => close(fd2)
- * fd1 >= 0 => dup2(fd1, fd2)
- *
- * Returns -1 with errno set if operation fails.
- */
-static int closefd(int fd1, int fd2) {
- int rv, orig_errno;
- fdEntry_t *fdEntry = getFdEntry(fd2);
- if (fdEntry == NULL) {
- errno = EBADF;
- return -1;
- }
-
- /*
- * Lock the fd to hold-off additional I/O on this fd.
- */
- pthread_mutex_lock(&(fdEntry->lock));
-
- {
- /* On fast machines we see that we enter dup2 before the
- * accepting thread had a chance to get and process the signal.
- * So in case we woke a thread up, give it some time to cope.
- * Also see https://bugs.openjdk.java.net/browse/JDK-8006395 */
- int num_woken = 0;
-
- /*
- * Send a wakeup signal to all threads blocked on this
- * file descriptor.
- */
- threadEntry_t *curr = fdEntry->threads;
- while (curr != NULL) {
- curr->intr = 1;
- pthread_kill( curr->thr, sigWakeup );
- num_woken ++;
- curr = curr->next;
- }
-
- if (num_woken > 0) {
- usleep(num_woken * 50);
- }
-
- /*
- * And close/dup the file descriptor
- * (restart if interrupted by signal)
- */
- do {
- if (fd1 < 0) {
- rv = close(fd2);
- } else {
- rv = dup2(fd1, fd2);
- }
- } while (rv == -1 && errno == EINTR);
- }
-
- /*
- * Unlock without destroying errno
- */
- orig_errno = errno;
- pthread_mutex_unlock(&(fdEntry->lock));
- errno = orig_errno;
-
- return rv;
-}
-
-/*
- * Wrapper for dup2 - same semantics as dup2 system call except
- * that any threads blocked in an I/O system call on fd2 will be
- * preempted and return -1/EBADF;
- */
-int NET_Dup2(int fd, int fd2) {
- if (fd < 0) {
- errno = EBADF;
- return -1;
- }
- return closefd(fd, fd2);
-}
-
-/*
- * Wrapper for close - same semantics as close system call
- * except that any threads blocked in an I/O on fd will be
- * preempted and the I/O system call will return -1/EBADF.
- */
-int NET_SocketClose(int fd) {
- return closefd(-1, fd);
-}
-
-/************** Basic I/O operations here ***************/
-
-/*
- * Macro to perform a blocking IO operation. Restarts
- * automatically if interrupted by signal (other than
- * our wakeup signal)
- */
-#define BLOCKING_IO_RETURN_INT(FD, FUNC) { \
- int ret; \
- threadEntry_t self; \
- fdEntry_t *fdEntry = getFdEntry(FD); \
- if (fdEntry == NULL) { \
- errno = EBADF; \
- return -1; \
- } \
- do { \
- startOp(fdEntry, &self); \
- ret = FUNC; \
- endOp(fdEntry, &self); \
- } while (ret == -1 && errno == EINTR); \
- return ret; \
-}
-
-int NET_Read(int s, void* buf, size_t len) {
- BLOCKING_IO_RETURN_INT( s, recv(s, buf, len, 0) );
-}
-
-int NET_ReadV(int s, const struct iovec * vector, int count) {
- BLOCKING_IO_RETURN_INT( s, readv(s, vector, count) );
-}
-
-int NET_RecvFrom(int s, void *buf, int len, unsigned int flags,
- struct sockaddr *from, int *fromlen) {
- socklen_t socklen = *fromlen;
- BLOCKING_IO_RETURN_INT( s, recvfrom(s, buf, len, flags, from, &socklen) );
- *fromlen = socklen;
-}
-
-int NET_Send(int s, void *msg, int len, unsigned int flags) {
- BLOCKING_IO_RETURN_INT( s, send(s, msg, len, flags) );
-}
-
-int NET_WriteV(int s, const struct iovec * vector, int count) {
- BLOCKING_IO_RETURN_INT( s, writev(s, vector, count) );
-}
-
-int NET_SendTo(int s, const void *msg, int len, unsigned int
- flags, const struct sockaddr *to, int tolen) {
- BLOCKING_IO_RETURN_INT( s, sendto(s, msg, len, flags, to, tolen) );
-}
-
-int NET_Accept(int s, struct sockaddr *addr, int *addrlen) {
- socklen_t socklen = *addrlen;
- BLOCKING_IO_RETURN_INT( s, accept(s, addr, &socklen) );
- *addrlen = socklen;
-}
-
-int NET_Connect(int s, struct sockaddr *addr, int addrlen) {
- int crc = -1, prc = -1;
- threadEntry_t self;
- fdEntry_t* fdEntry = getFdEntry(s);
-
- if (fdEntry == NULL) {
- errno = EBADF;
- return -1;
- }
-
- /* On AIX, when the system call connect() is interrupted, the connection
- * is not aborted and it will be established asynchronously by the kernel.
- * Hence, no need to restart connect() when EINTR is received
- */
- startOp(fdEntry, &self);
- crc = connect(s, addr, addrlen);
- endOp(fdEntry, &self);
-
- if (crc == -1 && errno == EINTR) {
- struct pollfd s_pollfd;
- int sockopt_arg = 0;
- socklen_t len;
-
- s_pollfd.fd = s;
- s_pollfd.events = POLLOUT | POLLERR;
-
- /* poll the file descriptor */
- do {
- startOp(fdEntry, &self);
- prc = poll(&s_pollfd, 1, -1);
- endOp(fdEntry, &self);
- } while (prc == -1 && errno == EINTR);
-
- if (prc < 0)
- return prc;
-
- len = sizeof(sockopt_arg);
-
- /* Check whether the connection has been established */
- if (getsockopt(s, SOL_SOCKET, SO_ERROR, &sockopt_arg, &len) == -1)
- return -1;
-
- if (sockopt_arg != 0 ) {
- errno = sockopt_arg;
- return -1;
- }
- } else {
- return crc;
- }
-
- /* At this point, fd is connected. Set successful return code */
- return 0;
-}
-
-int NET_Poll(struct pollfd *ufds, unsigned int nfds, int timeout) {
- BLOCKING_IO_RETURN_INT( ufds[0].fd, poll(ufds, nfds, timeout) );
-}
-
-/*
- * Wrapper for poll(s, timeout).
- * Auto restarts with adjusted timeout if interrupted by
- * signal other than our wakeup signal.
- */
-int NET_Timeout(int s, long timeout) {
- long prevtime = 0, newtime;
- struct timeval t;
- fdEntry_t *fdEntry = getFdEntry(s);
-
- /*
- * Check that fd hasn't been closed.
- */
- if (fdEntry == NULL) {
- errno = EBADF;
- return -1;
- }
-
- /*
- * Pick up current time as may need to adjust timeout
- */
- if (timeout > 0) {
- gettimeofday(&t, NULL);
- prevtime = t.tv_sec * 1000 + t.tv_usec / 1000;
- }
-
- for(;;) {
- struct pollfd pfd;
- int rv;
- threadEntry_t self;
-
- /*
- * Poll the fd. If interrupted by our wakeup signal
- * errno will be set to EBADF.
- */
- pfd.fd = s;
- pfd.events = POLLIN | POLLERR;
-
- startOp(fdEntry, &self);
- rv = poll(&pfd, 1, timeout);
- endOp(fdEntry, &self);
-
- /*
- * If interrupted then adjust timeout. If timeout
- * has expired return 0 (indicating timeout expired).
- */
- if (rv < 0 && errno == EINTR) {
- if (timeout > 0) {
- gettimeofday(&t, NULL);
- newtime = t.tv_sec * 1000 + t.tv_usec / 1000;
- timeout -= newtime - prevtime;
- if (timeout <= 0) {
- return 0;
- }
- prevtime = newtime;
- }
- } else {
- return rv;
- }
-
- }
-}