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Diffstat (limited to 'libs/pthreads/src/pthread_timedjoin_np.c')
| -rw-r--r-- | libs/pthreads/src/pthread_timedjoin_np.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/libs/pthreads/src/pthread_timedjoin_np.c b/libs/pthreads/src/pthread_timedjoin_np.c new file mode 100644 index 0000000000..854ba0abb5 --- /dev/null +++ b/libs/pthreads/src/pthread_timedjoin_np.c @@ -0,0 +1,187 @@ +/* + * pthread_timedjoin_np.c + * + * Description: + * This translation unit implements functions related to thread + * synchronisation. + * + * -------------------------------------------------------------------------- + * + * Pthreads4w - POSIX Threads Library for Win32 + * Copyright(C) 1998 John E. Bossom + * Copyright(C) 1999-2018, Pthreads4w contributors + * + * Homepage: https://sourceforge.net/projects/pthreads4w/ + * + * The current list of contributors is contained + * in the file CONTRIBUTORS included with the source + * code distribution. The list can also be seen at the + * following World Wide Web location: + * https://sourceforge.net/p/pthreads4w/wiki/Contributors/ + * + * This file is part of Pthreads4w. + * + * Pthreads4w 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 3 of the License, or + * (at your option) any later version. + * + * Pthreads4w 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 Pthreads4w. If not, see <http://www.gnu.org/licenses/>. * + */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif + +#include "pthread.h" +#include "implement.h" + +/* + * Not needed yet, but defining it should indicate clashes with build target + * environment that should be fixed. + */ +#if !defined(WINCE) +# include <signal.h> +#endif + + +int +pthread_timedjoin_np (pthread_t thread, void **value_ptr, const struct timespec *abstime) + /* + * ------------------------------------------------------ + * DOCPUBLIC + * This function waits for 'thread' to terminate and + * returns the thread's exit value if 'value_ptr' is not + * NULL or until 'abstime' passes and returns an + * error. If 'abstime' is NULL then the function waits + * forever, i.e. reverts to pthread_join behaviour. + * This function detaches the thread on successful + * completion. + * + * PARAMETERS + * thread + * an instance of pthread_t + * + * value_ptr + * pointer to an instance of pointer to void + * + * abstime + * pointer to an instance of struct timespec + * representing an absolute time value + * + * + * DESCRIPTION + * This function waits for 'thread' to terminate and + * returns the thread's exit value if 'value_ptr' is not + * NULL or until 'abstime' passes and returns an + * error. If 'abstime' is NULL then the function waits + * forever, i.e. reverts to pthread_join behaviour. + * This function detaches the thread on successful + * completion. + * NOTE: Detached threads cannot be joined or canceled. + * In this implementation 'abstime' will be + * resolved to the nearest millisecond. + * + * RESULTS + * 0 'thread' has completed + * ETIMEDOUT abstime passed + * EINVAL thread is not a joinable thread, + * ESRCH no thread could be found with ID 'thread', + * ENOENT thread couldn't find it's own valid handle, + * EDEADLK attempt to join thread with self + * + * ------------------------------------------------------ + */ +{ + int result; + pthread_t self; + DWORD milliseconds; + ptw32_thread_t * tp = (ptw32_thread_t *) thread.p; + ptw32_mcs_local_node_t node; + + if (abstime == NULL) + { + milliseconds = INFINITE; + } + else + { + /* + * Calculate timeout as milliseconds from current system time. + */ + milliseconds = ptw32_relmillisecs (abstime); + } + + ptw32_mcs_lock_acquire(&ptw32_thread_reuse_lock, &node); + + if (NULL == tp + || thread.x != tp->ptHandle.x) + { + result = ESRCH; + } + else if (PTHREAD_CREATE_DETACHED == tp->detachState) + { + result = EINVAL; + } + else + { + result = 0; + } + + ptw32_mcs_lock_release(&node); + + if (result == 0) + { + /* + * The target thread is joinable and can't be reused before we join it. + */ + self = pthread_self(); + + if (NULL == self.p) + { + result = ENOENT; + } + else if (pthread_equal (self, thread)) + { + result = EDEADLK; + } + else + { + /* + * Pthread_join is a cancellation point. + * If we are canceled then our target thread must not be + * detached (destroyed). This is guaranteed because + * pthreadCancelableTimedWait will not return if we + * are canceled. + */ + result = pthreadCancelableTimedWait (tp->threadH, milliseconds); + + if (0 == result) + { + if (value_ptr != NULL) + { + *value_ptr = tp->exitStatus; + } + + /* + * The result of making multiple simultaneous calls to + * pthread_join() or pthread_timedjoin_np() or pthread_detach() + * specifying the same target is undefined. + */ + result = pthread_detach (thread); + } + else if (ETIMEDOUT != result) + { + result = ESRCH; + } + } + } + + return (result); + +} |