| /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ |
| /* dbus-sysdeps-pthread.c Implements threads using pthreads (internal to libdbus) |
| * |
| * Copyright (C) 2002, 2003, 2006 Red Hat, Inc. |
| * |
| * Licensed under the Academic Free License version 2.1 |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| * |
| */ |
| |
| #include <config.h> |
| #include "dbus-internals.h" |
| #include "dbus-sysdeps.h" |
| #include "dbus-threads.h" |
| |
| #include <sys/time.h> |
| #include <pthread.h> |
| #include <string.h> |
| |
| #ifdef HAVE_ERRNO_H |
| #include <errno.h> |
| #endif |
| |
| #include <config.h> |
| |
| /* Whether we have a "monotonic" clock; i.e. a clock not affected by |
| * changes in system time. |
| * This is initialized once in check_monotonic_clock below. |
| * https://bugs.freedesktop.org/show_bug.cgi?id=18121 |
| */ |
| static dbus_bool_t have_monotonic_clock = 0; |
| |
| struct DBusRMutex { |
| pthread_mutex_t lock; /**< the lock */ |
| }; |
| |
| struct DBusCMutex { |
| pthread_mutex_t lock; /**< the lock */ |
| }; |
| |
| struct DBusCondVar { |
| pthread_cond_t cond; /**< the condition */ |
| }; |
| |
| #define DBUS_MUTEX(m) ((DBusMutex*) m) |
| #define DBUS_MUTEX_PTHREAD(m) ((DBusMutexPThread*) m) |
| |
| #define DBUS_COND_VAR(c) ((DBusCondVar*) c) |
| #define DBUS_COND_VAR_PTHREAD(c) ((DBusCondVarPThread*) c) |
| |
| |
| #ifdef DBUS_DISABLE_ASSERT |
| /* (tmp != 0) is a no-op usage to silence compiler */ |
| #define PTHREAD_CHECK(func_name, result_or_call) \ |
| do { int tmp = (result_or_call); if (tmp != 0) {;} } while (0) |
| #else |
| #define PTHREAD_CHECK(func_name, result_or_call) do { \ |
| int tmp = (result_or_call); \ |
| if (tmp != 0) { \ |
| _dbus_warn_check_failed ("pthread function %s failed with %d %s in %s\n", \ |
| func_name, tmp, strerror(tmp), _DBUS_FUNCTION_NAME); \ |
| } \ |
| } while (0) |
| #endif /* !DBUS_DISABLE_ASSERT */ |
| |
| DBusCMutex * |
| _dbus_platform_cmutex_new (void) |
| { |
| DBusCMutex *pmutex; |
| int result; |
| |
| pmutex = dbus_new (DBusCMutex, 1); |
| if (pmutex == NULL) |
| return NULL; |
| |
| result = pthread_mutex_init (&pmutex->lock, NULL); |
| |
| if (result == ENOMEM || result == EAGAIN) |
| { |
| dbus_free (pmutex); |
| return NULL; |
| } |
| else |
| { |
| PTHREAD_CHECK ("pthread_mutex_init", result); |
| } |
| |
| return pmutex; |
| } |
| |
| DBusRMutex * |
| _dbus_platform_rmutex_new (void) |
| { |
| DBusRMutex *pmutex; |
| pthread_mutexattr_t mutexattr; |
| int result; |
| |
| pmutex = dbus_new (DBusRMutex, 1); |
| if (pmutex == NULL) |
| return NULL; |
| |
| pthread_mutexattr_init (&mutexattr); |
| pthread_mutexattr_settype (&mutexattr, PTHREAD_MUTEX_RECURSIVE); |
| result = pthread_mutex_init (&pmutex->lock, &mutexattr); |
| pthread_mutexattr_destroy (&mutexattr); |
| |
| if (result == ENOMEM || result == EAGAIN) |
| { |
| dbus_free (pmutex); |
| return NULL; |
| } |
| else |
| { |
| PTHREAD_CHECK ("pthread_mutex_init", result); |
| } |
| |
| return pmutex; |
| } |
| |
| void |
| _dbus_platform_cmutex_free (DBusCMutex *mutex) |
| { |
| PTHREAD_CHECK ("pthread_mutex_destroy", pthread_mutex_destroy (&mutex->lock)); |
| dbus_free (mutex); |
| } |
| |
| void |
| _dbus_platform_rmutex_free (DBusRMutex *mutex) |
| { |
| PTHREAD_CHECK ("pthread_mutex_destroy", pthread_mutex_destroy (&mutex->lock)); |
| dbus_free (mutex); |
| } |
| |
| void |
| _dbus_platform_cmutex_lock (DBusCMutex *mutex) |
| { |
| PTHREAD_CHECK ("pthread_mutex_lock", pthread_mutex_lock (&mutex->lock)); |
| } |
| |
| void |
| _dbus_platform_rmutex_lock (DBusRMutex *mutex) |
| { |
| PTHREAD_CHECK ("pthread_mutex_lock", pthread_mutex_lock (&mutex->lock)); |
| } |
| |
| void |
| _dbus_platform_cmutex_unlock (DBusCMutex *mutex) |
| { |
| PTHREAD_CHECK ("pthread_mutex_unlock", pthread_mutex_unlock (&mutex->lock)); |
| } |
| |
| void |
| _dbus_platform_rmutex_unlock (DBusRMutex *mutex) |
| { |
| PTHREAD_CHECK ("pthread_mutex_unlock", pthread_mutex_unlock (&mutex->lock)); |
| } |
| |
| DBusCondVar * |
| _dbus_platform_condvar_new (void) |
| { |
| DBusCondVar *pcond; |
| pthread_condattr_t attr; |
| int result; |
| |
| pcond = dbus_new (DBusCondVar, 1); |
| if (pcond == NULL) |
| return NULL; |
| |
| pthread_condattr_init (&attr); |
| #ifdef HAVE_MONOTONIC_CLOCK |
| if (have_monotonic_clock) |
| pthread_condattr_setclock (&attr, CLOCK_MONOTONIC); |
| #endif |
| |
| result = pthread_cond_init (&pcond->cond, &attr); |
| pthread_condattr_destroy (&attr); |
| |
| if (result == EAGAIN || result == ENOMEM) |
| { |
| dbus_free (pcond); |
| return NULL; |
| } |
| else |
| { |
| PTHREAD_CHECK ("pthread_cond_init", result); |
| } |
| |
| return pcond; |
| } |
| |
| void |
| _dbus_platform_condvar_free (DBusCondVar *cond) |
| { |
| PTHREAD_CHECK ("pthread_cond_destroy", pthread_cond_destroy (&cond->cond)); |
| dbus_free (cond); |
| } |
| |
| void |
| _dbus_platform_condvar_wait (DBusCondVar *cond, |
| DBusCMutex *mutex) |
| { |
| PTHREAD_CHECK ("pthread_cond_wait", pthread_cond_wait (&cond->cond, &mutex->lock)); |
| } |
| |
| dbus_bool_t |
| _dbus_platform_condvar_wait_timeout (DBusCondVar *cond, |
| DBusCMutex *mutex, |
| int timeout_milliseconds) |
| { |
| struct timeval time_now; |
| struct timespec end_time; |
| int result; |
| |
| #ifdef HAVE_MONOTONIC_CLOCK |
| if (have_monotonic_clock) |
| { |
| struct timespec monotonic_timer; |
| clock_gettime (CLOCK_MONOTONIC,&monotonic_timer); |
| time_now.tv_sec = monotonic_timer.tv_sec; |
| time_now.tv_usec = monotonic_timer.tv_nsec / 1000; |
| } |
| else |
| /* This else falls through to gettimeofday */ |
| #endif |
| gettimeofday (&time_now, NULL); |
| |
| end_time.tv_sec = time_now.tv_sec + timeout_milliseconds / 1000; |
| end_time.tv_nsec = (time_now.tv_usec + (timeout_milliseconds % 1000) * 1000) * 1000; |
| if (end_time.tv_nsec > 1000*1000*1000) |
| { |
| end_time.tv_sec += 1; |
| end_time.tv_nsec -= 1000*1000*1000; |
| } |
| |
| result = pthread_cond_timedwait (&cond->cond, &mutex->lock, &end_time); |
| |
| if (result != ETIMEDOUT) |
| { |
| PTHREAD_CHECK ("pthread_cond_timedwait", result); |
| } |
| |
| /* return true if we did not time out */ |
| return result != ETIMEDOUT; |
| } |
| |
| void |
| _dbus_platform_condvar_wake_one (DBusCondVar *cond) |
| { |
| PTHREAD_CHECK ("pthread_cond_signal", pthread_cond_signal (&cond->cond)); |
| } |
| |
| static void |
| check_monotonic_clock (void) |
| { |
| #ifdef HAVE_MONOTONIC_CLOCK |
| struct timespec dummy; |
| if (clock_getres (CLOCK_MONOTONIC, &dummy) == 0) |
| have_monotonic_clock = TRUE; |
| #endif |
| } |
| |
| dbus_bool_t |
| _dbus_threads_init_platform_specific (void) |
| { |
| /* These have static variables, and we need to handle both the case |
| * where dbus_threads_init() has been called and when it hasn't; |
| * so initialize them before any threads are allowed to enter. |
| */ |
| check_monotonic_clock (); |
| (void) _dbus_check_setuid (); |
| return dbus_threads_init (NULL); |
| } |