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Diffstat (limited to 'lib/libpthread/thread/thr_mutex.c')
-rw-r--r--lib/libpthread/thread/thr_mutex.c414
1 files changed, 0 insertions, 414 deletions
diff --git a/lib/libpthread/thread/thr_mutex.c b/lib/libpthread/thread/thr_mutex.c
deleted file mode 100644
index d3801f1750c0..000000000000
--- a/lib/libpthread/thread/thr_mutex.c
+++ /dev/null
@@ -1,414 +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>
-#include <string.h>
-#ifdef _THREAD_SAFE
-#include <pthread.h>
-#include "pthread_private.h"
-
-static spinlock_t static_init_lock = _SPINLOCK_INITIALIZER;
-
-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;
-
- if (mutex == NULL) {
- ret = EINVAL;
- } else {
- /* Check if default mutex attributes: */
- if (mutex_attr == NULL || *mutex_attr == NULL)
- /* Default to a fast mutex: */
- type = PTHREAD_MUTEX_DEFAULT;
-
- 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;
-
- /* Process according to mutex type: */
- switch (type) {
- /* Fast mutex: */
- case PTHREAD_MUTEX_DEFAULT:
- case PTHREAD_MUTEX_NORMAL:
- case PTHREAD_MUTEX_ERRORCHECK:
- /* Nothing to do here. */
- break;
-
- /* Counting mutex: */
- case PTHREAD_MUTEX_RECURSIVE:
- /* 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;
- memset(&pmutex->lock, 0,
- sizeof(pmutex->lock));
- *mutex = pmutex;
- } else {
- free(pmutex);
- *mutex = NULL;
- }
- }
- }
- }
- /* Return the completion status: */
- return (ret);
-}
-
-int
-pthread_mutex_destroy(pthread_mutex_t * mutex)
-{
- int ret = 0;
-
- if (mutex == NULL || *mutex == NULL)
- ret = EINVAL;
- else {
- /* Lock the mutex structure: */
- _SPINLOCK(&(*mutex)->lock);
-
- /*
- * Free the memory allocated for the mutex
- * structure:
- */
- free(*mutex);
-
- /*
- * Leave the caller's pointer NULL now that
- * the mutex has been destroyed:
- */
- *mutex = NULL;
- }
-
- /* Return the completion status: */
- return (ret);
-}
-
-static int
-init_static (pthread_mutex_t *mutex)
-{
- int ret;
-
- _SPINLOCK(&static_init_lock);
-
- if (*mutex == NULL)
- ret = pthread_mutex_init(mutex, NULL);
- else
- ret = 0;
-
- _SPINUNLOCK(&static_init_lock);
-
- return(ret);
-}
-
-int
-pthread_mutex_trylock(pthread_mutex_t * mutex)
-{
- int ret = 0;
-
- if (mutex == NULL)
- ret = EINVAL;
-
- /*
- * If the mutex is statically initialized, perform the dynamic
- * initialization:
- */
- else if (*mutex != NULL || (ret = init_static(mutex)) == 0) {
- /* Lock the mutex structure: */
- _SPINLOCK(&(*mutex)->lock);
-
- /* Process according to mutex type: */
- switch ((*mutex)->m_type) {
- /* Fast mutex: */
- case PTHREAD_MUTEX_NORMAL:
- case PTHREAD_MUTEX_DEFAULT:
- case PTHREAD_MUTEX_ERRORCHECK:
- /* 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 PTHREAD_MUTEX_RECURSIVE:
- /* 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;
- }
-
- /* Unlock the mutex structure: */
- _SPINUNLOCK(&(*mutex)->lock);
- }
-
- /* Return the completion status: */
- return (ret);
-}
-
-int
-pthread_mutex_lock(pthread_mutex_t * mutex)
-{
- int ret = 0;
-
- if (mutex == NULL)
- ret = EINVAL;
-
- /*
- * If the mutex is statically initialized, perform the dynamic
- * initialization:
- */
- else if (*mutex != NULL || (ret = init_static(mutex)) == 0) {
- /* Lock the mutex structure: */
- _SPINLOCK(&(*mutex)->lock);
-
- /* Process according to mutex type: */
- switch ((*mutex)->m_type) {
- /* What SS2 define as a 'normal' mutex. This has to deadlock
- on attempts to get a lock you already own. */
- case PTHREAD_MUTEX_NORMAL:
- if ((*mutex)->m_owner == _thread_run) {
- /* Intetionally deadlock */
- for (;;)
- _thread_kern_sched_state(PS_MUTEX_WAIT, __FILE__, __LINE__);
- }
- goto COMMON_LOCK;
-
- /* Return error (not OK) on attempting to re-lock */
- case PTHREAD_MUTEX_ERRORCHECK:
- if ((*mutex)->m_owner == _thread_run) {
- ret = EDEADLK;
- break;
- }
-
- /* Fast mutexes do not check for any error conditions: */
- case PTHREAD_MUTEX_DEFAULT:
- COMMON_LOCK:
- /*
- * 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);
-
- /* Wait for the mutex: */
- _thread_kern_sched_state_unlock(
- PS_MUTEX_WAIT, &(*mutex)->lock,
- __FILE__, __LINE__);
-
- /* Lock the mutex again: */
- _SPINLOCK(&(*mutex)->lock);
- }
- }
- break;
-
- /* Counting mutex: */
- case PTHREAD_MUTEX_RECURSIVE:
- /*
- * 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);
-
- /* Wait for the mutex: */
- _thread_kern_sched_state_unlock(
- PS_MUTEX_WAIT, &(*mutex)->lock,
- __FILE__, __LINE__);
-
- /* Lock the mutex again: */
- _SPINLOCK(&(*mutex)->lock);
- }
- }
-
- /* 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;
- }
-
- /* Unlock the mutex structure: */
- _SPINUNLOCK(&(*mutex)->lock);
- }
-
- /* Return the completion status: */
- return (ret);
-}
-
-int
-pthread_mutex_unlock(pthread_mutex_t * mutex)
-{
- int ret = 0;
-
- if (mutex == NULL || *mutex == NULL) {
- ret = EINVAL;
- } else {
- /* Lock the mutex structure: */
- _SPINLOCK(&(*mutex)->lock);
-
- /* Process according to mutex type: */
- switch ((*mutex)->m_type) {
- /* Default & normal mutexes do not really need to check for
- any error conditions: */
- case PTHREAD_MUTEX_NORMAL:
- case PTHREAD_MUTEX_DEFAULT:
- case PTHREAD_MUTEX_ERRORCHECK:
- /* Check if the running thread is not the owner of the mutex: */
- if ((*mutex)->m_owner != _thread_run) {
- /* Return an invalid argument error: */
- ret = (*mutex)->m_owner ? EPERM : 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 PTHREAD_MUTEX_RECURSIVE:
- /* 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 > 1) {
- /* Decrement the count: */
- (*mutex)->m_data.m_count--;
- } else {
- (*mutex)->m_data.m_count = 0;
- /*
- * Get the next thread from the queue of threads waiting on
- * the mutex:
- */
- 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;
- }
-
- /* Unlock the mutex structure: */
- _SPINUNLOCK(&(*mutex)->lock);
- }
-
- /* Return the completion status: */
- return (ret);
-}
-#endif
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