mirror of
https://github.com/eclipse-threadx/threadx.git
synced 2025-11-16 04:24:48 +00:00
114 lines
6.6 KiB
C
114 lines
6.6 KiB
C
/**************************************************************************/
|
|
/* */
|
|
/* Copyright (c) Microsoft Corporation. All rights reserved. */
|
|
/* */
|
|
/* This software is licensed under the Microsoft Software License */
|
|
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
|
|
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
|
|
/* and in the root directory of this software. */
|
|
/* */
|
|
/**************************************************************************/
|
|
|
|
|
|
/**************************************************************************/
|
|
/**************************************************************************/
|
|
/** */
|
|
/** POSIX wrapper for THREADX */
|
|
/** */
|
|
/** */
|
|
/** */
|
|
/**************************************************************************/
|
|
/**************************************************************************/
|
|
|
|
/* Include necessary system files. */
|
|
|
|
#include "tx_api.h" /* Threadx API */
|
|
#include "pthread.h" /* Posix API */
|
|
#include "px_int.h" /* Posix helper functions */
|
|
|
|
|
|
/**************************************************************************/
|
|
/* */
|
|
/* FUNCTION RELEASE */
|
|
/* */
|
|
/* pthread_cond_signal PORTABLE C */
|
|
/* 6.x */
|
|
/* AUTHOR */
|
|
/* */
|
|
/* William E. Lamie, Microsoft Corporation */
|
|
/* */
|
|
/* DESCRIPTION */
|
|
/* */
|
|
/* This function shall unblock at least one of the threads that are */
|
|
/* blocked on the specified condition variable cond */
|
|
/* (if any threads are blocked on cond).If more than one thread is */
|
|
/* blocked on a condition variable, the scheduling policy shall */
|
|
/* determine the order in which threads are unblocked.When each thread */
|
|
/* unblocked as a result of a pthread_cond_signal returns from its call*/
|
|
/* to pthread_cond_wait or pthread_cond_timedwait, the thread shall own*/
|
|
/* the mutex with which it called pthread_cond_wait or */
|
|
/* pthread_cond_timedwait.The thread(s) that are unblocked shall */
|
|
/* contend for the mutex according to the scheduling policy */
|
|
/* (if applicable), and as if each had called pthread_mutex_lock. */
|
|
/* The pthread_cond_broadcast or pthread_cond_signal functions may be */
|
|
/* called by a thread whether or not it currently owns the mutex that */
|
|
/* threads calling pthread_cond_wait or pthread_cond_timedwait have */
|
|
/* associated with the condition variable during their waits; however, */
|
|
/* if predictable scheduling behavior is required,then that mutex shall*/
|
|
/* be locked by the thread calling pthread_cond_signal. */
|
|
/* This function shall have no effect if there are no threads currently*/
|
|
/* blocked on cond. */
|
|
/* */
|
|
/* INPUT */
|
|
/* */
|
|
/* Nothing */
|
|
/* */
|
|
/* OUTPUT */
|
|
/* */
|
|
/* Nothing */
|
|
/* */
|
|
/* CALLS */
|
|
/* */
|
|
/* tx_semaphore_prioritize line up pthreads waiting at semaphore*/
|
|
/* tx_semaphore_put ThreadX semaphore put service */
|
|
/* */
|
|
/* CALLED BY */
|
|
/* */
|
|
/* Application Code */
|
|
/* */
|
|
/* RELEASE HISTORY */
|
|
/* */
|
|
/* DATE NAME DESCRIPTION */
|
|
/* */
|
|
/* xx-xx-xxxx William E. Lamie Initial Version 6.x */
|
|
/* */
|
|
/**************************************************************************/
|
|
INT pthread_cond_signal(pthread_cond_t *cond)
|
|
{
|
|
|
|
TX_SEMAPHORE *semaphore_ptr;
|
|
UINT status;
|
|
|
|
/* Get the condition variable's internal semaphore. */
|
|
/* Simply convert the COndition variable control block into a semaphore a cast */
|
|
semaphore_ptr = (&( cond->cond_semaphore ));
|
|
if ( semaphore_ptr->tx_semaphore_suspended_count)
|
|
{
|
|
status = tx_semaphore_prioritize(semaphore_ptr);
|
|
if ( status != TX_SUCCESS)
|
|
{
|
|
posix_errno = EINVAL;
|
|
posix_set_pthread_errno(EINVAL);
|
|
return(EINVAL);
|
|
}
|
|
status = tx_semaphore_put(semaphore_ptr);
|
|
if ( status != TX_SUCCESS)
|
|
{
|
|
posix_errno = EINVAL;
|
|
posix_set_pthread_errno(EINVAL);
|
|
return(EINVAL);
|
|
}
|
|
}
|
|
return(OK);
|
|
}
|