mirror of
https://github.com/eclipse-threadx/threadx.git
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113 lines
6.3 KiB
C
113 lines
6.3 KiB
C
/***************************************************************************
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* Copyright (c) 2024 Microsoft Corporation
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*
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* This program and the accompanying materials are made available under the
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* terms of the MIT License which is available at
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* https://opensource.org/licenses/MIT.
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*
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* SPDX-License-Identifier: MIT
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**************************************************************************/
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/**************************************************************************/
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/**************************************************************************/
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/** */
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/** POSIX wrapper for THREADX */
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/** */
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/** */
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/** */
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/**************************************************************************/
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/**************************************************************************/
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/* Include necessary system files. */
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#include "tx_api.h" /* Threadx API */
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#include "pthread.h" /* Posix API */
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#include "px_int.h" /* Posix helper functions */
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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* pthread_cond_signal PORTABLE C */
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/* 6.1.7 */
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/* AUTHOR */
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/* */
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/* William E. Lamie, Microsoft Corporation */
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/* */
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/* DESCRIPTION */
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/* */
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/* This function shall unblock at least one of the threads that are */
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/* blocked on the specified condition variable cond */
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/* (if any threads are blocked on cond).If more than one thread is */
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/* blocked on a condition variable, the scheduling policy shall */
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/* determine the order in which threads are unblocked.When each thread */
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/* unblocked as a result of a pthread_cond_signal returns from its call*/
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/* to pthread_cond_wait or pthread_cond_timedwait, the thread shall own*/
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/* the mutex with which it called pthread_cond_wait or */
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/* pthread_cond_timedwait.The thread(s) that are unblocked shall */
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/* contend for the mutex according to the scheduling policy */
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/* (if applicable), and as if each had called pthread_mutex_lock. */
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/* The pthread_cond_broadcast or pthread_cond_signal functions may be */
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/* called by a thread whether or not it currently owns the mutex that */
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/* threads calling pthread_cond_wait or pthread_cond_timedwait have */
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/* associated with the condition variable during their waits; however, */
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/* if predictable scheduling behavior is required,then that mutex shall*/
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/* be locked by the thread calling pthread_cond_signal. */
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/* This function shall have no effect if there are no threads currently*/
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/* blocked on cond. */
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/* */
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/* INPUT */
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/* */
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/* Nothing */
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/* */
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/* OUTPUT */
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/* */
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/* Nothing */
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/* */
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/* CALLS */
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/* */
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/* tx_semaphore_prioritize line up pthreads waiting at semaphore*/
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/* tx_semaphore_put ThreadX semaphore put service */
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/* */
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/* CALLED BY */
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/* */
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/* Application Code */
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/* */
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/* RELEASE HISTORY */
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/* */
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/* DATE NAME DESCRIPTION */
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/* */
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/* 06-02-2021 William E. Lamie Initial Version 6.1.7 */
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/* */
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/**************************************************************************/
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INT pthread_cond_signal(pthread_cond_t *cond)
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{
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TX_SEMAPHORE *semaphore_ptr;
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UINT status;
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/* Get the condition variable's internal semaphore. */
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/* Simply convert the COndition variable control block into a semaphore a cast */
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semaphore_ptr = (&( cond->cond_semaphore ));
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if ( semaphore_ptr->tx_semaphore_suspended_count)
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{
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status = tx_semaphore_prioritize(semaphore_ptr);
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if ( status != TX_SUCCESS)
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{
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posix_errno = EINVAL;
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posix_set_pthread_errno(EINVAL);
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return(EINVAL);
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}
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status = tx_semaphore_put(semaphore_ptr);
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if ( status != TX_SUCCESS)
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{
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posix_errno = EINVAL;
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posix_set_pthread_errno(EINVAL);
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return(EINVAL);
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}
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}
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return(OK);
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}
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