mirror of
https://github.com/azure-rtos/threadx
synced 2025-02-06 08:08:27 +08:00
147 lines
7.3 KiB
C
147 lines
7.3 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_broadcast 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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/* These functions shall unblock all threads currently blocked on a */
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/* specified condition variable cond. */
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/* If more than one thread is blocked on a condition variable, */
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/* the scheduling policy shall determine the order in which threads are*/
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/* unblocked. When each thread unblocked as a result of this function */
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/* call returns from its call to pthread_cond_wait or */
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/* pthread_cond_timedwait, the thread shall own the mutex with which it*/
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/* called pthread_cond_wait or pthread_cond_timedwait. The thread(s) */
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/* that are unblocked shall contend for the mutex according to the */
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/* scheduling policy (if applicable), and as if each had called */
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/* pthread_mutex_lock.The pthread_cond_broadcast function may be called*/
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/* by a thread whether or not it currently owns the mutex that threads */
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/* calling pthread_cond_wait or pthread_cond_timedwait have associated */
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/* with the condition variable during their waits; however, */
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/* if predictable scheduling behavior is required, then that mutex */
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/* shall be locked by the thread calling pthread_cond_broadcast. */
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/* The pthread_cond_broadcast function shall have no effect if there */
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/* are no threads currently blocked on cond. */
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/* */
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/* INPUT */
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/* */
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/* cond condition variable */
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/* */
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/* OUTPUT */
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/* */
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/* Ok if successful */
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/* Error in case of any errors */
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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_thread_identify to check which pthread? */
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/* tx_thread_preemption_change to disable thread preemption */
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/* tx_semaphore_put ThreadX semaphore put service */
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/* tx_thread_preemption_change to enable thread preemption */
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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_broadcast(pthread_cond_t *cond)
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{
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TX_SEMAPHORE *semaphore_ptr;
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TX_THREAD *thread;
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UINT status;
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ULONG sem_count;
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UINT old_threshold,dummy;
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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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sem_count = semaphore_ptr->tx_semaphore_suspended_count;
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if (!sem_count)
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return(OK);
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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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/* get to know about current thread */
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thread = tx_thread_identify();
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/* Got the current thread , now raise its preemption threshold */
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/* that way the current thread does not get descheduled when */
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/* threads with higher priority are activated */
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tx_thread_preemption_change(thread,0,&old_threshold);
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while( sem_count)
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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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/* restore changed preemption threshold */
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tx_thread_preemption_change(thread,old_threshold,&dummy);
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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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sem_count--;
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}
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/* restore changed preemption threshold */
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tx_thread_preemption_change(thread,old_threshold,&dummy);
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return(OK);
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}
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