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authorMike Frysinger <vapier@gentoo.org>2005-11-15 03:13:04 +0000
committerMike Frysinger <vapier@gentoo.org>2005-11-15 03:13:04 +0000
commita9f5aa1cc96fc2c71f19a9c3e9dcbee0e78f83ca (patch)
tree2c5d251bdfd06d0a76cec9fc507b1873b4bbbdad /libpthread/linuxthreads/pthread.c
parentfd6dde5a19092be5bb1990dadd5c595d2ed0b3aa (diff)
rename current stable linuxthreads to linuxthreads.old to prepare for import of latest glibc version
Diffstat (limited to 'libpthread/linuxthreads/pthread.c')
-rw-r--r--libpthread/linuxthreads/pthread.c1044
1 files changed, 0 insertions, 1044 deletions
diff --git a/libpthread/linuxthreads/pthread.c b/libpthread/linuxthreads/pthread.c
deleted file mode 100644
index fed3d8c72..000000000
--- a/libpthread/linuxthreads/pthread.c
+++ /dev/null
@@ -1,1044 +0,0 @@
-/* Linuxthreads - a simple clone()-based implementation of Posix */
-/* threads for Linux. */
-/* Copyright (C) 1996 Xavier Leroy (Xavier.Leroy@inria.fr) */
-/* */
-/* This program is free software; you can redistribute it and/or */
-/* modify it under the terms of the GNU Library General Public License */
-/* as published by the Free Software Foundation; either version 2 */
-/* of the License, or (at your option) any later version. */
-/* */
-/* This program 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 Library General Public License for more details. */
-
-/* Thread creation, initialization, and basic low-level routines */
-
-#define __FORCE_GLIBC
-#include <features.h>
-#define __USE_GNU
-#include <errno.h>
-#include <netdb.h> /* for h_errno */
-#include <stddef.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sys/wait.h>
-#include <sys/resource.h>
-#include "pthread.h"
-#include "internals.h"
-#include "spinlock.h"
-#include "restart.h"
-#include "debug.h" /* added to linuxthreads -StS */
-
-
-/* Mods for uClibc: Some includes */
-#include <signal.h>
-#include <sys/types.h>
-#include <sys/syscall.h>
-
-/* mods for uClibc: getpwd and getpagesize are the syscalls */
-#define __getpid getpid
-#define __getpagesize getpagesize
-/* mods for uClibc: __libc_sigaction is not in any standard headers */
-extern int __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact);
-
-
-/* These variables are used by the setup code. */
-extern int _errno;
-extern int _h_errno;
-
-
-/* Descriptor of the initial thread */
-
-struct _pthread_descr_struct __pthread_initial_thread = {
- &__pthread_initial_thread, /* pthread_descr p_nextlive */
- &__pthread_initial_thread, /* pthread_descr p_prevlive */
- NULL, /* pthread_descr p_nextwaiting */
- NULL, /* pthread_descr p_nextlock */
- PTHREAD_THREADS_MAX, /* pthread_t p_tid */
- 0, /* int p_pid */
- 0, /* int p_priority */
- &__pthread_handles[0].h_lock, /* struct _pthread_fastlock * p_lock */
- 0, /* int p_signal */
- NULL, /* sigjmp_buf * p_signal_buf */
- NULL, /* sigjmp_buf * p_cancel_buf */
- 0, /* char p_terminated */
- 0, /* char p_detached */
- 0, /* char p_exited */
- NULL, /* void * p_retval */
- 0, /* int p_retval */
- NULL, /* pthread_descr p_joining */
- NULL, /* struct _pthread_cleanup_buffer * p_cleanup */
- 0, /* char p_cancelstate */
- 0, /* char p_canceltype */
- 0, /* char p_canceled */
- &_errno, /* int *p_errnop */
- 0, /* int p_errno */
- &_h_errno, /* int *p_h_errnop */
- 0, /* int p_h_errno */
- NULL, /* char * p_in_sighandler */
- 0, /* char p_sigwaiting */
- PTHREAD_START_ARGS_INITIALIZER, /* struct pthread_start_args p_start_args */
- {NULL}, /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */
- {NULL}, /* void * p_libc_specific[_LIBC_TSD_KEY_N] */
- 0, /* int p_userstack */
- NULL, /* void * p_guardaddr */
- 0, /* size_t p_guardsize */
- &__pthread_initial_thread, /* pthread_descr p_self */
- 0, /* Always index 0 */
- 0, /* int p_report_events */
- {{{0, }}, 0, NULL}, /* td_eventbuf_t p_eventbuf */
- __ATOMIC_INITIALIZER, /* struct pthread_atomic p_resume_count */
- 0, /* char p_woken_by_cancel */
- 0, /* char p_condvar_avail */
- 0, /* char p_sem_avail */
- NULL, /* struct pthread_extricate_if *p_extricate */
- NULL, /* pthread_readlock_info *p_readlock_list; */
- NULL, /* pthread_readlock_info *p_readlock_free; */
- 0 /* int p_untracked_readlock_count; */
-#ifdef __UCLIBC_HAS_XLOCALE__
- ,
- &__global_locale_data, /* __locale_t locale; */
-#endif /* __UCLIBC_HAS_XLOCALE__ */
-};
-
-/* Descriptor of the manager thread; none of this is used but the error
- variables, the p_pid and p_priority fields,
- and the address for identification. */
-#define manager_thread (&__pthread_manager_thread)
-struct _pthread_descr_struct __pthread_manager_thread = {
- NULL, /* pthread_descr p_nextlive */
- NULL, /* pthread_descr p_prevlive */
- NULL, /* pthread_descr p_nextwaiting */
- NULL, /* pthread_descr p_nextlock */
- 0, /* int p_tid */
- 0, /* int p_pid */
- 0, /* int p_priority */
- &__pthread_handles[1].h_lock, /* struct _pthread_fastlock * p_lock */
- 0, /* int p_signal */
- NULL, /* sigjmp_buf * p_signal_buf */
- NULL, /* sigjmp_buf * p_cancel_buf */
- 0, /* char p_terminated */
- 0, /* char p_detached */
- 0, /* char p_exited */
- NULL, /* void * p_retval */
- 0, /* int p_retval */
- NULL, /* pthread_descr p_joining */
- NULL, /* struct _pthread_cleanup_buffer * p_cleanup */
- 0, /* char p_cancelstate */
- 0, /* char p_canceltype */
- 0, /* char p_canceled */
- &__pthread_manager_thread.p_errno, /* int *p_errnop */
- 0, /* int p_errno */
- NULL, /* int *p_h_errnop */
- 0, /* int p_h_errno */
- NULL, /* char * p_in_sighandler */
- 0, /* char p_sigwaiting */
- PTHREAD_START_ARGS_INITIALIZER, /* struct pthread_start_args p_start_args */
- {NULL}, /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */
- {NULL}, /* void * p_libc_specific[_LIBC_TSD_KEY_N] */
- 0, /* int p_userstack */
- NULL, /* void * p_guardaddr */
- 0, /* size_t p_guardsize */
- &__pthread_manager_thread, /* pthread_descr p_self */
- 1, /* Always index 1 */
- 0, /* int p_report_events */
- {{{0, }}, 0, NULL}, /* td_eventbuf_t p_eventbuf */
- __ATOMIC_INITIALIZER, /* struct pthread_atomic p_resume_count */
- 0, /* char p_woken_by_cancel */
- 0, /* char p_condvar_avail */
- 0, /* char p_sem_avail */
- NULL, /* struct pthread_extricate_if *p_extricate */
- NULL, /* pthread_readlock_info *p_readlock_list; */
- NULL, /* pthread_readlock_info *p_readlock_free; */
- 0 /* int p_untracked_readlock_count; */
-#ifdef __UCLIBC_HAS_XLOCALE__
- ,
- &__global_locale_data, /* __locale_t locale; */
-#endif /* __UCLIBC_HAS_XLOCALE__ */
-};
-
-/* Pointer to the main thread (the father of the thread manager thread) */
-/* Originally, this is the initial thread, but this changes after fork() */
-
-pthread_descr __pthread_main_thread = &__pthread_initial_thread;
-
-/* Limit between the stack of the initial thread (above) and the
- stacks of other threads (below). Aligned on a STACK_SIZE boundary. */
-
-char *__pthread_initial_thread_bos = NULL;
-
-/* For non-MMU systems also remember to stack top of the initial thread.
- * This is adapted when other stacks are malloc'ed since we don't know
- * the bounds a-priori. -StS */
-
-#ifndef __ARCH_HAS_MMU__
-char *__pthread_initial_thread_tos = NULL;
-#endif /* __ARCH_HAS_MMU__ */
-
-/* File descriptor for sending requests to the thread manager. */
-/* Initially -1, meaning that the thread manager is not running. */
-
-int __pthread_manager_request = -1;
-
-/* Other end of the pipe for sending requests to the thread manager. */
-
-int __pthread_manager_reader;
-
-/* Limits of the thread manager stack */
-
-char *__pthread_manager_thread_bos = NULL;
-char *__pthread_manager_thread_tos = NULL;
-
-/* For process-wide exit() */
-
-int __pthread_exit_requested = 0;
-int __pthread_exit_code = 0;
-
-/* Communicate relevant LinuxThreads constants to gdb */
-
-const int __pthread_threads_max = PTHREAD_THREADS_MAX;
-const int __pthread_sizeof_handle = sizeof(struct pthread_handle_struct);
-const int __pthread_offsetof_descr = offsetof(struct pthread_handle_struct, h_descr);
-const int __pthread_offsetof_pid = offsetof(struct _pthread_descr_struct,
- p_pid);
-const int __linuxthreads_pthread_sizeof_descr
- = sizeof(struct _pthread_descr_struct);
-
-const int __linuxthreads_initial_report_events;
-
-const char __linuxthreads_version[] = VERSION;
-
-/* Forward declarations */
-static void pthread_onexit_process(int retcode, void *arg);
-static void pthread_handle_sigcancel(int sig);
-static void pthread_handle_sigrestart(int sig);
-static void pthread_handle_sigdebug(int sig);
-int __pthread_timedsuspend_new(pthread_descr self, const struct timespec *abstime);
-
-/* Signal numbers used for the communication.
- In these variables we keep track of the used variables. If the
- platform does not support any real-time signals we will define the
- values to some unreasonable value which will signal failing of all
- the functions below. */
-#ifndef __NR_rt_sigaction
-static int current_rtmin = -1;
-static int current_rtmax = -1;
-int __pthread_sig_restart = SIGUSR1;
-int __pthread_sig_cancel = SIGUSR2;
-int __pthread_sig_debug;
-#else
-
-#if __SIGRTMAX - __SIGRTMIN >= 3
-static int current_rtmin = __SIGRTMIN + 3;
-static int current_rtmax = __SIGRTMAX;
-int __pthread_sig_restart = __SIGRTMIN;
-int __pthread_sig_cancel = __SIGRTMIN + 1;
-int __pthread_sig_debug = __SIGRTMIN + 2;
-void (*__pthread_restart)(pthread_descr) = __pthread_restart_new;
-void (*__pthread_suspend)(pthread_descr) = __pthread_wait_for_restart_signal;
-int (*__pthread_timedsuspend)(pthread_descr, const struct timespec *) = __pthread_timedsuspend_new;
-#else
-static int current_rtmin = __SIGRTMIN;
-static int current_rtmax = __SIGRTMAX;
-int __pthread_sig_restart = SIGUSR1;
-int __pthread_sig_cancel = SIGUSR2;
-int __pthread_sig_debug;
-void (*__pthread_restart)(pthread_descr) = __pthread_restart_old;
-void (*__pthread_suspend)(pthread_descr) = __pthread_suspend_old;
-int (*__pthread_timedsuspend)(pthread_descr, const struct timespec *) = __pthread_timedsuspend_old;
-
-#endif
-
-/* Return number of available real-time signal with highest priority. */
-int __libc_current_sigrtmin (void)
-{
- return current_rtmin;
-}
-
-/* Return number of available real-time signal with lowest priority. */
-int __libc_current_sigrtmax (void)
-{
- return current_rtmax;
-}
-
-/* Allocate real-time signal with highest/lowest available
- priority. Please note that we don't use a lock since we assume
- this function to be called at program start. */
-int __libc_allocate_rtsig (int high)
-{
- if (current_rtmin == -1 || current_rtmin > current_rtmax)
- /* We don't have anymore signal available. */
- return -1;
- return high ? current_rtmin++ : current_rtmax--;
-}
-#endif
-
-/* Initialize the pthread library.
- Initialization is split in two functions:
- - a constructor function that blocks the __pthread_sig_restart signal
- (must do this very early, since the program could capture the signal
- mask with e.g. sigsetjmp before creating the first thread);
- - a regular function called from pthread_create when needed. */
-
-static void pthread_initialize(void) __attribute__((constructor));
-
- /* Do some minimal initialization which has to be done during the
- startup of the C library. */
-void __pthread_initialize_minimal(void)
-{
- /* If we have special thread_self processing, initialize
- * that for the main thread now. */
-#ifdef INIT_THREAD_SELF
- INIT_THREAD_SELF(&__pthread_initial_thread, 0);
-#endif
-}
-
-
-static void pthread_initialize(void)
-{
- struct sigaction sa;
- sigset_t mask;
- struct rlimit limit;
- int max_stack;
-
- /* If already done (e.g. by a constructor called earlier!), bail out */
- if (__pthread_initial_thread_bos != NULL) return;
-#ifdef TEST_FOR_COMPARE_AND_SWAP
- /* Test if compare-and-swap is available */
- __pthread_has_cas = compare_and_swap_is_available();
-#endif
- /* For the initial stack, reserve at least STACK_SIZE bytes of stack
- below the current stack address, and align that on a
- STACK_SIZE boundary. */
- __pthread_initial_thread_bos =
- (char *)(((long)CURRENT_STACK_FRAME - 2 * STACK_SIZE) & ~(STACK_SIZE - 1));
- /* Update the descriptor for the initial thread. */
- __pthread_initial_thread.p_pid = __getpid();
- /* If we have special thread_self processing, initialize that for the
- main thread now. */
-#ifdef INIT_THREAD_SELF
- INIT_THREAD_SELF(&__pthread_initial_thread, 0);
-#endif
- /* The errno/h_errno variable of the main thread are the global ones. */
- __pthread_initial_thread.p_errnop = &_errno;
- __pthread_initial_thread.p_h_errnop = &_h_errno;
-
-#ifdef __UCLIBC_HAS_XLOCALE__
- /* The locale of the main thread is the current locale in use. */
- __pthread_initial_thread.locale = __curlocale_var;
-#endif /* __UCLIBC_HAS_XLOCALE__ */
-
- { /* uClibc-specific stdio initialization for threads. */
- FILE *fp;
-
- _stdio_user_locking = 0; /* 2 if threading not initialized */
- for (fp = _stdio_openlist; fp != NULL; fp = fp->__nextopen) {
- if (fp->__user_locking != 1) {
- fp->__user_locking = 0;
- }
- }
- }
-
- /* Play with the stack size limit to make sure that no stack ever grows
- beyond STACK_SIZE minus two pages (one page for the thread descriptor
- immediately beyond, and one page to act as a guard page). */
-
-#ifdef __ARCH_HAS_MMU__
- /* We cannot allocate a huge chunk of memory to mmap all thread stacks later
- * on a non-MMU system. Thus, we don't need the rlimit either. -StS */
- getrlimit(RLIMIT_STACK, &limit);
- max_stack = STACK_SIZE - 2 * __getpagesize();
- if (limit.rlim_cur > max_stack) {
- limit.rlim_cur = max_stack;
- setrlimit(RLIMIT_STACK, &limit);
- }
-#else
- /* For non-MMU assume __pthread_initial_thread_tos at upper page boundary, and
- * __pthread_initial_thread_bos at address 0. These bounds are refined as we
- * malloc other stack frames such that they don't overlap. -StS
- */
- __pthread_initial_thread_tos =
- (char *)(((long)CURRENT_STACK_FRAME + __getpagesize()) & ~(__getpagesize() - 1));
- __pthread_initial_thread_bos = (char *) 1; /* set it non-zero so we know we have been here */
- PDEBUG("initial thread stack bounds: bos=%p, tos=%p\n",
- __pthread_initial_thread_bos, __pthread_initial_thread_tos);
-#endif /* __ARCH_HAS_MMU__ */
-
- /* Setup signal handlers for the initial thread.
- Since signal handlers are shared between threads, these settings
- will be inherited by all other threads. */
- sa.sa_handler = pthread_handle_sigrestart;
- sigemptyset(&sa.sa_mask);
- sa.sa_flags = 0;
- __libc_sigaction(__pthread_sig_restart, &sa, NULL);
- sa.sa_handler = pthread_handle_sigcancel;
- sigaddset(&sa.sa_mask, __pthread_sig_restart);
- // sa.sa_flags = 0;
- __libc_sigaction(__pthread_sig_cancel, &sa, NULL);
- if (__pthread_sig_debug > 0) {
- sa.sa_handler = pthread_handle_sigdebug;
- sigemptyset(&sa.sa_mask);
- // sa.sa_flags = 0;
- __libc_sigaction(__pthread_sig_debug, &sa, NULL);
- }
- /* Initially, block __pthread_sig_restart. Will be unblocked on demand. */
- sigemptyset(&mask);
- sigaddset(&mask, __pthread_sig_restart);
- sigprocmask(SIG_BLOCK, &mask, NULL);
- /* And unblock __pthread_sig_cancel if it has been blocked. */
- sigdelset(&mask, __pthread_sig_restart);
- sigaddset(&mask, __pthread_sig_cancel);
- sigprocmask(SIG_UNBLOCK, &mask, NULL);
- /* Register an exit function to kill all other threads. */
- /* Do it early so that user-registered atexit functions are called
- before pthread_onexit_process. */
- on_exit(pthread_onexit_process, NULL);
-}
-
-void __pthread_initialize(void)
-{
- pthread_initialize();
-}
-
-int __pthread_initialize_manager(void)
-{
- int manager_pipe[2];
- int pid;
- int report_events;
- struct pthread_request request;
-
- /* If basic initialization not done yet (e.g. we're called from a
- constructor run before our constructor), do it now */
- if (__pthread_initial_thread_bos == NULL) pthread_initialize();
- /* Setup stack for thread manager */
- __pthread_manager_thread_bos = malloc(THREAD_MANAGER_STACK_SIZE);
- if (__pthread_manager_thread_bos == NULL) return -1;
- __pthread_manager_thread_tos =
- __pthread_manager_thread_bos + THREAD_MANAGER_STACK_SIZE;
-
- /* On non-MMU systems we make sure that the initial thread bounds don't overlap
- * with the manager stack frame */
- NOMMU_INITIAL_THREAD_BOUNDS(__pthread_manager_thread_tos,__pthread_manager_thread_bos);
- PDEBUG("manager stack: size=%d, bos=%p, tos=%p\n", THREAD_MANAGER_STACK_SIZE,
- __pthread_manager_thread_bos, __pthread_manager_thread_tos);
-#if 0
- PDEBUG("initial stack: estimate bos=%p, tos=%p\n",
- __pthread_initial_thread_bos, __pthread_initial_thread_tos);
-#endif
-
- /* Setup pipe to communicate with thread manager */
- if (pipe(manager_pipe) == -1) {
- free(__pthread_manager_thread_bos);
- return -1;
- }
- /* Start the thread manager */
- pid = 0;
-#ifdef USE_TLS
- if (__linuxthreads_initial_report_events != 0)
- THREAD_SETMEM (((pthread_descr) NULL), p_report_events,
- __linuxthreads_initial_report_events);
- report_events = THREAD_GETMEM (((pthread_descr) NULL), p_report_events);
-#else
- if (__linuxthreads_initial_report_events != 0)
- __pthread_initial_thread.p_report_events
- = __linuxthreads_initial_report_events;
- report_events = __pthread_initial_thread.p_report_events;
-#endif
- if (__builtin_expect (report_events, 0))
- {
- /* It's a bit more complicated. We have to report the creation of
- the manager thread. */
- int idx = __td_eventword (TD_CREATE);
- uint32_t mask = __td_eventmask (TD_CREATE);
-
- if ((mask & (__pthread_threads_events.event_bits[idx]
- | __pthread_initial_thread.p_eventbuf.eventmask.event_bits[idx]))
- != 0)
- {
-
- __pthread_lock(__pthread_manager_thread.p_lock, NULL);
-
- pid = clone(__pthread_manager_event,
- (void **) __pthread_manager_thread_tos,
- CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND,
- (void *)(long)manager_pipe[0]);
-
- if (pid != -1)
- {
- /* Now fill in the information about the new thread in
- the newly created thread's data structure. We cannot let
- the new thread do this since we don't know whether it was
- already scheduled when we send the event. */
- __pthread_manager_thread.p_eventbuf.eventdata =
- &__pthread_manager_thread;
- __pthread_manager_thread.p_eventbuf.eventnum = TD_CREATE;
- __pthread_last_event = &__pthread_manager_thread;
- __pthread_manager_thread.p_tid = 2* PTHREAD_THREADS_MAX + 1;
- __pthread_manager_thread.p_pid = pid;
-
- /* Now call the function which signals the event. */
- __linuxthreads_create_event ();
- }
- /* Now restart the thread. */
- __pthread_unlock(__pthread_manager_thread.p_lock);
- }
- }
-
- if (pid == 0) {
- pid = clone(__pthread_manager, (void **) __pthread_manager_thread_tos,
- CLONE_VM | CLONE_FS | CLONE_FILES | CLONE_SIGHAND,
- (void *)(long)manager_pipe[0]);
- }
- if (pid == -1) {
- free(__pthread_manager_thread_bos);
- __libc_close(manager_pipe[0]);
- __libc_close(manager_pipe[1]);
- return -1;
- }
- __pthread_manager_request = manager_pipe[1]; /* writing end */
- __pthread_manager_reader = manager_pipe[0]; /* reading end */
- __pthread_manager_thread.p_tid = 2* PTHREAD_THREADS_MAX + 1;
- __pthread_manager_thread.p_pid = pid;
-
- /* Make gdb aware of new thread manager */
- if (__pthread_threads_debug && __pthread_sig_debug > 0)
- {
- raise(__pthread_sig_debug);
- /* We suspend ourself and gdb will wake us up when it is
- ready to handle us. */
- __pthread_wait_for_restart_signal(thread_self());
- }
- /* Synchronize debugging of the thread manager */
- PDEBUG("send REQ_DEBUG to manager thread\n");
- request.req_kind = REQ_DEBUG;
- TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request,
- (char *) &request, sizeof(request)));
- return 0;
-}
-
-/* Thread creation */
-
-int pthread_create(pthread_t *thread, const pthread_attr_t *attr,
- void * (*start_routine)(void *), void *arg)
-{
- pthread_descr self = thread_self();
- struct pthread_request request;
- if (__pthread_manager_request < 0) {
- if (__pthread_initialize_manager() < 0) return EAGAIN;
- }
- request.req_thread = self;
- request.req_kind = REQ_CREATE;
- request.req_args.create.attr = attr;
- request.req_args.create.fn = start_routine;
- request.req_args.create.arg = arg;
- sigprocmask(SIG_SETMASK, (const sigset_t *) NULL,
- &request.req_args.create.mask);
- PDEBUG("write REQ_CREATE to manager thread\n");
- TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request,
- (char *) &request, sizeof(request)));
- PDEBUG("before suspend(self)\n");
- suspend(self);
- PDEBUG("after suspend(self)\n");
- if (THREAD_GETMEM(self, p_retcode) == 0)
- *thread = (pthread_t) THREAD_GETMEM(self, p_retval);
- return THREAD_GETMEM(self, p_retcode);
-}
-
-/* Simple operations on thread identifiers */
-
-pthread_t pthread_self(void)
-{
- pthread_descr self = thread_self();
- return THREAD_GETMEM(self, p_tid);
-}
-
-int pthread_equal(pthread_t thread1, pthread_t thread2)
-{
- return thread1 == thread2;
-}
-
-/* Helper function for thread_self in the case of user-provided stacks */
-
-#ifndef THREAD_SELF
-
-pthread_descr __pthread_find_self()
-{
- char * sp = CURRENT_STACK_FRAME;
- pthread_handle h;
-
- /* __pthread_handles[0] is the initial thread, __pthread_handles[1] is
- the manager threads handled specially in thread_self(), so start at 2 */
- h = __pthread_handles + 2;
- while (! (sp <= (char *) h->h_descr && sp >= h->h_bottom)) h++;
-
-#ifdef DEBUG_PT
- if (h->h_descr == NULL) {
- printf("*** %s ERROR descriptor is NULL!!!!! ***\n\n", __FUNCTION__);
- _exit(1);
- }
-#endif
-
- return h->h_descr;
-}
-#else
-
-static pthread_descr thread_self_stack(void)
-{
- char *sp = CURRENT_STACK_FRAME;
- pthread_handle h;
-
- if (sp >= __pthread_manager_thread_bos && sp < __pthread_manager_thread_tos)
- return manager_thread;
- h = __pthread_handles + 2;
-# ifdef USE_TLS
- while (h->h_descr == NULL
- || ! (sp <= (char *) h->h_descr->p_stackaddr && sp >= h->h_bottom))
- h++;
-# else
- while (! (sp <= (char *) h->h_descr && sp >= h->h_bottom))
- h++;
-# endif
- return h->h_descr;
-}
-
-#endif
-
-/* Thread scheduling */
-
-int pthread_setschedparam(pthread_t thread, int policy,
- const struct sched_param *param)
-{
- pthread_handle handle = thread_handle(thread);
- pthread_descr th;
-
- __pthread_lock(&handle->h_lock, NULL);
- if (invalid_handle(handle, thread)) {
- __pthread_unlock(&handle->h_lock);
- return ESRCH;
- }
- th = handle->h_descr;
- if (sched_setscheduler(th->p_pid, policy, param) == -1) {
- __pthread_unlock(&handle->h_lock);
- return errno;
- }
- th->p_priority = policy == SCHED_OTHER ? 0 : param->sched_priority;
- __pthread_unlock(&handle->h_lock);
- if (__pthread_manager_request >= 0)
- __pthread_manager_adjust_prio(th->p_priority);
- return 0;
-}
-
-int pthread_getschedparam(pthread_t thread, int *policy,
- struct sched_param *param)
-{
- pthread_handle handle = thread_handle(thread);
- int pid, pol;
-
- __pthread_lock(&handle->h_lock, NULL);
- if (invalid_handle(handle, thread)) {
- __pthread_unlock(&handle->h_lock);
- return ESRCH;
- }
- pid = handle->h_descr->p_pid;
- __pthread_unlock(&handle->h_lock);
- pol = sched_getscheduler(pid);
- if (pol == -1) return errno;
- if (sched_getparam(pid, param) == -1) return errno;
- *policy = pol;
- return 0;
-}
-
-/* Process-wide exit() request */
-
-static void pthread_onexit_process(int retcode, void *arg)
-{
- struct pthread_request request;
- pthread_descr self = thread_self();
-
- if (__pthread_manager_request >= 0) {
- request.req_thread = self;
- request.req_kind = REQ_PROCESS_EXIT;
- request.req_args.exit.code = retcode;
- TEMP_FAILURE_RETRY(__libc_write(__pthread_manager_request,
- (char *) &request, sizeof(request)));
- suspend(self);
- /* Main thread should accumulate times for thread manager and its
- children, so that timings for main thread account for all threads. */
- if (self == __pthread_main_thread) {
- waitpid(__pthread_manager_thread.p_pid, NULL, __WCLONE);
- /* Since all threads have been asynchronously terminated
- * (possibly holding locks), free cannot be used any more. */
- __pthread_manager_thread_bos = __pthread_manager_thread_tos = NULL;
- }
- }
-}
-
-/* The handler for the RESTART signal just records the signal received
- in the thread descriptor, and optionally performs a siglongjmp
- (for pthread_cond_timedwait). */
-
-static void pthread_handle_sigrestart(int sig)
-{
- pthread_descr self = thread_self();
- THREAD_SETMEM(self, p_signal, sig);
- if (THREAD_GETMEM(self, p_signal_jmp) != NULL)
- siglongjmp(*THREAD_GETMEM(self, p_signal_jmp), 1);
-}
-
-/* The handler for the CANCEL signal checks for cancellation
- (in asynchronous mode), for process-wide exit and exec requests.
- For the thread manager thread, redirect the signal to
- __pthread_manager_sighandler. */
-
-static void pthread_handle_sigcancel(int sig)
-{
- pthread_descr self = thread_self();
- sigjmp_buf * jmpbuf;
-
-
- if (self == &__pthread_manager_thread)
- {
-#ifdef THREAD_SELF
- /* A new thread might get a cancel signal before it is fully
- initialized, so that the thread register might still point to the
- manager thread. Double check that this is really the manager
- thread. */
- pthread_descr real_self = thread_self_stack();
- if (real_self == &__pthread_manager_thread)
- {
- __pthread_manager_sighandler(sig);
- return;
- }
- /* Oops, thread_self() isn't working yet.. */
- self = real_self;
-# ifdef INIT_THREAD_SELF
- INIT_THREAD_SELF(self, self->p_nr);
-# endif
-#else
- __pthread_manager_sighandler(sig);
- return;
-#endif
- }
- if (__builtin_expect (__pthread_exit_requested, 0)) {
- /* Main thread should accumulate times for thread manager and its
- children, so that timings for main thread account for all threads. */
- if (self == __pthread_main_thread) {
-#ifdef USE_TLS
- waitpid(__pthread_manager_thread->p_pid, NULL, __WCLONE);
-#else
- waitpid(__pthread_manager_thread.p_pid, NULL, __WCLONE);
-#endif
- }
- _exit(__pthread_exit_code);
- }
- if (__builtin_expect (THREAD_GETMEM(self, p_canceled), 0)
- && THREAD_GETMEM(self, p_cancelstate) == PTHREAD_CANCEL_ENABLE) {
- if (THREAD_GETMEM(self, p_canceltype) == PTHREAD_CANCEL_ASYNCHRONOUS)
- pthread_exit(PTHREAD_CANCELED);
- jmpbuf = THREAD_GETMEM(self, p_cancel_jmp);
- if (jmpbuf != NULL) {
- THREAD_SETMEM(self, p_cancel_jmp, NULL);
- siglongjmp(*jmpbuf, 1);
- }
- }
-}
-
-/* Handler for the DEBUG signal.
- The debugging strategy is as follows:
- On reception of a REQ_DEBUG request (sent by new threads created to
- the thread manager under debugging mode), the thread manager throws
- __pthread_sig_debug to itself. The debugger (if active) intercepts
- this signal, takes into account new threads and continue execution
- of the thread manager by propagating the signal because it doesn't
- know what it is specifically done for. In the current implementation,
- the thread manager simply discards it. */
-
-static void pthread_handle_sigdebug(int sig)
-{
- /* Nothing */
-}
-
-/* Reset the state of the thread machinery after a fork().
- Close the pipe used for requests and set the main thread to the forked
- thread.
- Notice that we can't free the stack segments, as the forked thread
- may hold pointers into them. */
-
-void __pthread_reset_main_thread()
-{
- pthread_descr self = thread_self();
-
- if (__pthread_manager_request != -1) {
- /* Free the thread manager stack */
- free(__pthread_manager_thread_bos);
- __pthread_manager_thread_bos = __pthread_manager_thread_tos = NULL;
- /* Close the two ends of the pipe */
- __libc_close(__pthread_manager_request);
- __libc_close(__pthread_manager_reader);
- __pthread_manager_request = __pthread_manager_reader = -1;
- }
-
- /* Update the pid of the main thread */
- THREAD_SETMEM(self, p_pid, __getpid());
- /* Make the forked thread the main thread */
- __pthread_main_thread = self;
- THREAD_SETMEM(self, p_nextlive, self);
- THREAD_SETMEM(self, p_prevlive, self);
- /* Now this thread modifies the global variables. */
- THREAD_SETMEM(self, p_errnop, &_errno);
- THREAD_SETMEM(self, p_h_errnop, &_h_errno);
-}
-
-/* Process-wide exec() request */
-
-void __pthread_kill_other_threads_np(void)
-{
- struct sigaction sa;
- /* Terminate all other threads and thread manager */
- pthread_onexit_process(0, NULL);
- /* Make current thread the main thread in case the calling thread
- changes its mind, does not exec(), and creates new threads instead. */
- __pthread_reset_main_thread();
- /* Reset the signal handlers behaviour for the signals the
- implementation uses since this would be passed to the new
- process. */
- sigemptyset(&sa.sa_mask);
- sa.sa_flags = 0;
- sa.sa_handler = SIG_DFL;
- __libc_sigaction(__pthread_sig_restart, &sa, NULL);
- __libc_sigaction(__pthread_sig_cancel, &sa, NULL);
- if (__pthread_sig_debug > 0)
- __libc_sigaction(__pthread_sig_debug, &sa, NULL);
-}
-weak_alias (__pthread_kill_other_threads_np, pthread_kill_other_threads_np)
-
-/* Concurrency symbol level. */
-static int current_level;
-
-int __pthread_setconcurrency(int level)
-{
- /* We don't do anything unless we have found a useful interpretation. */
- current_level = level;
- return 0;
-}
-weak_alias (__pthread_setconcurrency, pthread_setconcurrency)
-
-int __pthread_getconcurrency(void)
-{
- return current_level;
-}
-weak_alias (__pthread_getconcurrency, pthread_getconcurrency)
-
-
-/* Primitives for controlling thread execution */
-
-void __pthread_wait_for_restart_signal(pthread_descr self)
-{
- sigset_t mask;
-
- sigprocmask(SIG_SETMASK, NULL, &mask); /* Get current signal mask */
- sigdelset(&mask, __pthread_sig_restart); /* Unblock the restart signal */
- THREAD_SETMEM(self, p_signal, 0);
- do {
- sigsuspend(&mask); /* Wait for signal */
- } while (THREAD_GETMEM(self, p_signal) !=__pthread_sig_restart);
-
- READ_MEMORY_BARRIER(); /* See comment in __pthread_restart_new */
-}
-
-#ifndef __NR_rt_sigaction
-/* The _old variants are for 2.0 and early 2.1 kernels which don't have RT
- signals.
- On these kernels, we use SIGUSR1 and SIGUSR2 for restart and cancellation.
- Since the restart signal does not queue, we use an atomic counter to create
- queuing semantics. This is needed to resolve a rare race condition in
- pthread_cond_timedwait_relative. */
-
-void __pthread_restart_old(pthread_descr th)
-{
- if (atomic_increment(&th->p_resume_count) == -1)
- kill(th->p_pid, __pthread_sig_restart);
-}
-
-void __pthread_suspend_old(pthread_descr self)
-{
- if (atomic_decrement(&self->p_resume_count) <= 0)
- __pthread_wait_for_restart_signal(self);
-}
-
-int
-__pthread_timedsuspend_old(pthread_descr self, const struct timespec *abstime)
-{
- sigset_t unblock, initial_mask;
- int was_signalled = 0;
- sigjmp_buf jmpbuf;
-
- if (atomic_decrement(&self->p_resume_count) == 0) {
- /* Set up a longjmp handler for the restart signal, unblock
- the signal and sleep. */
-
- if (sigsetjmp(jmpbuf, 1) == 0) {
- THREAD_SETMEM(self, p_signal_jmp, &jmpbuf);
- THREAD_SETMEM(self, p_signal, 0);
- /* Unblock the restart signal */
- sigemptyset(&unblock);
- sigaddset(&unblock, __pthread_sig_restart);
- sigprocmask(SIG_UNBLOCK, &unblock, &initial_mask);
-
- while (1) {
- struct timeval now;
- struct timespec reltime;
-
- /* Compute a time offset relative to now. */
- __gettimeofday (&now, NULL);
- reltime.tv_nsec = abstime->tv_nsec - now.tv_usec * 1000;
- reltime.tv_sec = abstime->tv_sec - now.tv_sec;
- if (reltime.tv_nsec < 0) {
- reltime.tv_nsec += 1000000000;
- reltime.tv_sec -= 1;
- }
-
- /* Sleep for the required duration. If woken by a signal,
- resume waiting as required by Single Unix Specification. */
- if (reltime.tv_sec < 0 || __libc_nanosleep(&reltime, NULL) == 0)
- break;
- }
-
- /* Block the restart signal again */
- sigprocmask(SIG_SETMASK, &initial_mask, NULL);
- was_signalled = 0;
- } else {
- was_signalled = 1;
- }
- THREAD_SETMEM(self, p_signal_jmp, NULL);
- }
-
- /* Now was_signalled is true if we exited the above code
- due to the delivery of a restart signal. In that case,
- we know we have been dequeued and resumed and that the
- resume count is balanced. Otherwise, there are some
- cases to consider. First, try to bump up the resume count
- back to zero. If it goes to 1, it means restart() was
- invoked on this thread. The signal must be consumed
- and the count bumped down and everything is cool. We
- can return a 1 to the caller.
- Otherwise, no restart was delivered yet, so a potential
- race exists; we return a 0 to the caller which must deal
- with this race in an appropriate way; for example by
- atomically removing the thread from consideration for a
- wakeup---if such a thing fails, it means a restart is
- being delivered. */
-
- if (!was_signalled) {
- if (atomic_increment(&self->p_resume_count) != -1) {
- __pthread_wait_for_restart_signal(self);
- atomic_decrement(&self->p_resume_count); /* should be zero now! */
- /* woke spontaneously and consumed restart signal */
- return 1;
- }
- /* woke spontaneously but did not consume restart---caller must resolve */
- return 0;
- }
- /* woken due to restart signal */
- return 1;
-}
-#endif /* __NR_rt_sigaction */
-
-
-#ifdef __NR_rt_sigaction
-void __pthread_restart_new(pthread_descr th)
-{
- /* The barrier is proabably not needed, in which case it still documents
- our assumptions. The intent is to commit previous writes to shared
- memory so the woken thread will have a consistent view. Complementary
- read barriers are present to the suspend functions. */
- WRITE_MEMORY_BARRIER();
- kill(th->p_pid, __pthread_sig_restart);
-}
-
-int __pthread_timedsuspend_new(pthread_descr self, const struct timespec *abstime)
-{
- sigset_t unblock, initial_mask;
- int was_signalled = 0;
- sigjmp_buf jmpbuf;
-
- if (sigsetjmp(jmpbuf, 1) == 0) {
- THREAD_SETMEM(self, p_signal_jmp, &jmpbuf);
- THREAD_SETMEM(self, p_signal, 0);
- /* Unblock the restart signal */
- sigemptyset(&unblock);
- sigaddset(&unblock, __pthread_sig_restart);
- sigprocmask(SIG_UNBLOCK, &unblock, &initial_mask);
-
- while (1) {
- struct timeval now;
- struct timespec reltime;
-
- /* Compute a time offset relative to now. */
- gettimeofday (&now, NULL);
- reltime.tv_nsec = abstime->tv_nsec - now.tv_usec * 1000;
- reltime.tv_sec = abstime->tv_sec - now.tv_sec;
- if (reltime.tv_nsec < 0) {
- reltime.tv_nsec += 1000000000;
- reltime.tv_sec -= 1;
- }
-
- /* Sleep for the required duration. If woken by a signal,
- resume waiting as required by Single Unix Specification. */
- if (reltime.tv_sec < 0 || __libc_nanosleep(&reltime, NULL) == 0)
- break;
- }
-
- /* Block the restart signal again */
- sigprocmask(SIG_SETMASK, &initial_mask, NULL);
- was_signalled = 0;
- } else {
- was_signalled = 1;
- }
- THREAD_SETMEM(self, p_signal_jmp, NULL);
-
- /* Now was_signalled is true if we exited the above code
- due to the delivery of a restart signal. In that case,
- everything is cool. We have been removed from whatever
- we were waiting on by the other thread, and consumed its signal.
-
- Otherwise we this thread woke up spontaneously, or due to a signal other
- than restart. This is an ambiguous case that must be resolved by
- the caller; the thread is still eligible for a restart wakeup
- so there is a race. */
-
- READ_MEMORY_BARRIER(); /* See comment in __pthread_restart_new */
- return was_signalled;
-}
-#endif
-
-/* Debugging aid */
-
-#ifdef DEBUG_PT
-#include <stdarg.h>
-
-void __pthread_message(char * fmt, ...)
-{
- char buffer[1024];
- va_list args;
- sprintf(buffer, "%05d : ", __getpid());
- va_start(args, fmt);
- vsnprintf(buffer + 8, sizeof(buffer) - 8, fmt, args);
- va_end(args);
- TEMP_FAILURE_RETRY(__libc_write(2, buffer, strlen(buffer)));
-}
-
-#endif
-
-
-#ifndef __PIC__
-/* We need a hook to force the cancelation wrappers to be linked in when
- static libpthread is used. */
-extern const int __pthread_provide_wrappers;
-static const int *const __pthread_require_wrappers =
- &__pthread_provide_wrappers;
-#endif