summaryrefslogtreecommitdiffstats
path: root/lib/libpthread/thread/thr_mutex.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/libpthread/thread/thr_mutex.c')
-rw-r--r--lib/libpthread/thread/thr_mutex.c377
1 files changed, 0 insertions, 377 deletions
diff --git a/lib/libpthread/thread/thr_mutex.c b/lib/libpthread/thread/thr_mutex.c
deleted file mode 100644
index e6be6de..0000000
--- a/lib/libpthread/thread/thr_mutex.c
+++ /dev/null
@@ -1,377 +0,0 @@
-/*
- * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by John Birrell.
- * 4. Neither the name of the author nor the names of any co-contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- */
-#include <stdlib.h>
-#include <errno.h>
-#ifdef _THREAD_SAFE
-#include <pthread.h>
-#include "pthread_private.h"
-
-int
-pthread_mutex_init(pthread_mutex_t * mutex,
- const pthread_mutexattr_t * mutex_attr)
-{
- enum pthread_mutextype type;
- pthread_mutex_t pmutex;
- int ret = 0;
- int status;
-
- if (mutex == NULL) {
- ret = EINVAL;
- } else {
- /* Check if default mutex attributes: */
- if (mutex_attr == NULL || *mutex_attr == NULL) {
- /* Default to a fast mutex: */
- type = MUTEX_TYPE_FAST;
- } else if ((*mutex_attr)->m_type >= MUTEX_TYPE_MAX) {
- /* Return an invalid argument error: */
- ret = EINVAL;
- } else {
- /* Use the requested mutex type: */
- type = (*mutex_attr)->m_type;
- }
-
- /* Check no errors so far: */
- if (ret == 0) {
- if ((pmutex = (pthread_mutex_t) malloc(sizeof(struct pthread_mutex))) == NULL) {
- ret = ENOMEM;
- } else {
- /* Reset the mutex flags: */
- pmutex->m_flags = 0;
-
- /* Block signals: */
- _thread_kern_sig_block(&status);
-
- /* Process according to mutex type: */
- switch (type) {
- /* Fast mutex: */
- case MUTEX_TYPE_FAST:
- /* Nothing to do here. */
- break;
-
- /* Counting mutex: */
- case MUTEX_TYPE_COUNTING_FAST:
- /* Reset the mutex count: */
- pmutex->m_data.m_count = 0;
- break;
-
- /* Trap invalid mutex types: */
- default:
- /* Return an invalid argument error: */
- ret = EINVAL;
- break;
- }
- if (ret == 0) {
- /* Initialise the rest of the mutex: */
- _thread_queue_init(&pmutex->m_queue);
- pmutex->m_flags |= MUTEX_FLAGS_INITED;
- pmutex->m_owner = NULL;
- pmutex->m_type = type;
- *mutex = pmutex;
- } else {
- free(pmutex);
- *mutex = NULL;
- }
-
- /* Unblock signals: */
- _thread_kern_sig_unblock(status);
- }
- }
- }
- /* Return the completion status: */
- return (ret);
-}
-
-int
-pthread_mutex_destroy(pthread_mutex_t * mutex)
-{
- int ret = 0;
- int status;
-
- if (mutex == NULL || *mutex == NULL) {
- ret = EINVAL;
- } else {
- /* Block signals: */
- _thread_kern_sig_block(&status);
-
- /* Process according to mutex type: */
- switch ((*mutex)->m_type) {
- /* Fast mutex: */
- case MUTEX_TYPE_FAST:
- /* Nothing to do here. */
- break;
-
- /* Counting mutex: */
- case MUTEX_TYPE_COUNTING_FAST:
- /* Reset the mutex count: */
- (*mutex)->m_data.m_count = 0;
- break;
-
- /* Trap undefined mutex types: */
- default:
- /* Return an invalid argument error: */
- ret = EINVAL;
- break;
- }
-
- /* Clean up the mutex in case that others want to use it: */
- _thread_queue_init(&(*mutex)->m_queue);
- (*mutex)->m_owner = NULL;
- (*mutex)->m_flags = 0;
-
- /* Unblock signals: */
- _thread_kern_sig_unblock(status);
- }
-
- /* Return the completion status: */
- return (ret);
-}
-
-int
-pthread_mutex_trylock(pthread_mutex_t * mutex)
-{
- int ret = 0;
- int status;
-
- if (mutex == NULL || *mutex == NULL) {
- ret = EINVAL;
- } else {
- /* Block signals: */
- _thread_kern_sig_block(&status);
-
- /* Process according to mutex type: */
- switch ((*mutex)->m_type) {
- /* Fast mutex: */
- case MUTEX_TYPE_FAST:
- /* Check if this mutex is not locked: */
- if ((*mutex)->m_owner == NULL) {
- /* Lock the mutex for the running thread: */
- (*mutex)->m_owner = _thread_run;
- } else {
- /* Return a busy error: */
- ret = EBUSY;
- }
- break;
-
- /* Counting mutex: */
- case MUTEX_TYPE_COUNTING_FAST:
- /* Check if this mutex is locked: */
- if ((*mutex)->m_owner != NULL) {
- /*
- * Check if the mutex is locked by the running
- * thread:
- */
- if ((*mutex)->m_owner == _thread_run) {
- /* Increment the lock count: */
- (*mutex)->m_data.m_count++;
- } else {
- /* Return a busy error: */
- ret = EBUSY;
- }
- } else {
- /* Lock the mutex for the running thread: */
- (*mutex)->m_owner = _thread_run;
- }
- break;
-
- /* Trap invalid mutex types: */
- default:
- /* Return an invalid argument error: */
- ret = EINVAL;
- break;
- }
-
- /* Unblock signals: */
- _thread_kern_sig_unblock(status);
- }
-
- /* Return the completion status: */
- return (ret);
-}
-
-int
-pthread_mutex_lock(pthread_mutex_t * mutex)
-{
- int ret = 0;
- int status;
-
- if (mutex == NULL || *mutex == NULL) {
- ret = EINVAL;
- } else {
- /* Block signals: */
- _thread_kern_sig_block(&status);
-
- /* Process according to mutex type: */
- switch ((*mutex)->m_type) {
- /* Fast mutexes do not check for any error conditions: */
- case MUTEX_TYPE_FAST:
- /*
- * Enter a loop to wait for the mutex to be locked by the
- * current thread:
- */
- while ((*mutex)->m_owner != _thread_run) {
- /* Check if the mutex is not locked: */
- if ((*mutex)->m_owner == NULL) {
- /* Lock the mutex for this thread: */
- (*mutex)->m_owner = _thread_run;
- } else {
- /*
- * Join the queue of threads waiting to lock
- * the mutex:
- */
- _thread_queue_enq(&(*mutex)->m_queue, _thread_run);
-
- /* Block signals: */
- _thread_kern_sched_state(PS_MUTEX_WAIT, __FILE__, __LINE__);
-
- /* Block signals: */
- _thread_kern_sig_block(NULL);
- }
- }
- break;
-
- /* Counting mutex: */
- case MUTEX_TYPE_COUNTING_FAST:
- /*
- * Enter a loop to wait for the mutex to be locked by the
- * current thread:
- */
- while ((*mutex)->m_owner != _thread_run) {
- /* Check if the mutex is not locked: */
- if ((*mutex)->m_owner == NULL) {
- /* Lock the mutex for this thread: */
- (*mutex)->m_owner = _thread_run;
-
- /* Reset the lock count for this mutex: */
- (*mutex)->m_data.m_count = 0;
- } else {
- /*
- * Join the queue of threads waiting to lock
- * the mutex:
- */
- _thread_queue_enq(&(*mutex)->m_queue, _thread_run);
-
- /* Block signals: */
- _thread_kern_sched_state(PS_MUTEX_WAIT, __FILE__, __LINE__);
-
- /* Block signals: */
- _thread_kern_sig_block(NULL);
- }
- }
-
- /* Increment the lock count for this mutex: */
- (*mutex)->m_data.m_count++;
- break;
-
- /* Trap invalid mutex types: */
- default:
- /* Return an invalid argument error: */
- ret = EINVAL;
- break;
- }
-
- /* Unblock signals: */
- _thread_kern_sig_unblock(status);
- }
-
- /* Return the completion status: */
- return (ret);
-}
-
-int
-pthread_mutex_unlock(pthread_mutex_t * mutex)
-{
- int ret = 0;
- int status;
-
- if (mutex == NULL || *mutex == NULL) {
- ret = EINVAL;
- } else {
- /* Block signals: */
- _thread_kern_sig_block(&status);
-
- /* Process according to mutex type: */
- switch ((*mutex)->m_type) {
- /* Fast mutexes do not check for any error conditions: */
- case MUTEX_TYPE_FAST:
- /* Check if the running thread is not the owner of the mutex: */
- if ((*mutex)->m_owner != _thread_run) {
- /* Return an invalid argument error: */
- ret = EINVAL;
- }
- /*
- * Get the next thread from the queue of threads waiting on
- * the mutex:
- */
- else if (((*mutex)->m_owner = _thread_queue_deq(&(*mutex)->m_queue)) != NULL) {
- /* Allow the new owner of the mutex to run: */
- PTHREAD_NEW_STATE((*mutex)->m_owner,PS_RUNNING);
- }
- break;
-
- /* Counting mutex: */
- case MUTEX_TYPE_COUNTING_FAST:
- /* Check if the running thread is not the owner of the mutex: */
- if ((*mutex)->m_owner != _thread_run) {
- /* Return an invalid argument error: */
- ret = EINVAL;
- }
- /* Check if there are still counts: */
- else if ((*mutex)->m_data.m_count) {
- /* Decrement the count: */
- (*mutex)->m_data.m_count--;
- }
- /*
- * Get the next thread from the queue of threads waiting on
- * the mutex:
- */
- else if (((*mutex)->m_owner = _thread_queue_deq(&(*mutex)->m_queue)) != NULL) {
- /* Allow the new owner of the mutex to run: */
- PTHREAD_NEW_STATE((*mutex)->m_owner,PS_RUNNING);
- }
- break;
-
- /* Trap invalid mutex types: */
- default:
- /* Return an invalid argument error: */
- ret = EINVAL;
- break;
- }
-
- /* Unblock signals: */
- _thread_kern_sig_unblock(status);
- }
-
- /* Return the completion status: */
- return (ret);
-}
-#endif
OpenPOWER on IntegriCloud