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Set wakeup time in pthread_cond_wait() to `forever' (-1) to prevent

Browse Source 
calling thread from being rescheduled based on an unspecified wakeup
time.

Bug/fix pointed out by Alexandre Fenyo <fenyo@email.enst.fr>.
This commit is contained in:
John Birrell 1997-04-11 22:38:22 +00:00
parent 2dc545bba5
commit 8253a7d685
3 changed files with 123 additions and 72 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

65
lib/libc_r/uthread/uthread_cond.c
View File

@ -48,8 +48,8 @@ pthread_cond_init(pthread_cond_t * cond, const pthread_condattr_t * cond_attr)
rval = -1;
} else {
/*
* Check if a pointer to a condition variable attribute structure was
* passed by the caller:
* Check if a pointer to a condition variable attribute
* structure was passed by the caller:
*/
if (cond_attr != NULL && *cond_attr != NULL) {
/* Default to a fast condition variable: */
@ -61,12 +61,12 @@ pthread_cond_init(pthread_cond_t * cond, const pthread_condattr_t * cond_attr)
/* Process according to condition variable type: */
switch (type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Nothing to do here. */
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -76,7 +76,8 @@ pthread_cond_init(pthread_cond_t * cond, const pthread_condattr_t * cond_attr)
/* Check for no errors: */
if (rval == 0) {
if ((pcond = (pthread_cond_t) malloc(sizeof(struct pthread_cond))) == NULL) {
if ((pcond = (pthread_cond_t)
malloc(sizeof(struct pthread_cond))) == NULL) {
errno = ENOMEM;
rval = -1;
} else {
@ -106,12 +107,12 @@ pthread_cond_destroy(pthread_cond_t * cond)
} else {
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Nothing to do here. */
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -147,16 +148,23 @@ pthread_cond_wait(pthread_cond_t * cond, pthread_mutex_t * mutex)
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Queue the running thread for the condition variable: */
_thread_queue_enq(&(*cond)->c_queue, _thread_run);
/*
* Queue the running thread for the condition
* variable:
*/
_thread_queue_enq(&(*cond)->c_queue, _thread_run);
/* Unlock the mutex: */
pthread_mutex_unlock(mutex);
/* Wait forever: */
_thread_run->wakeup_time.tv_sec = -1;
/* Schedule the next thread: */
_thread_kern_sched_state(PS_COND_WAIT, __FILE__, __LINE__);
_thread_kern_sched_state(PS_COND_WAIT,
__FILE__, __LINE__);
/* Block signals: */
_thread_kern_sig_block(NULL);
@ -165,7 +173,7 @@ pthread_cond_wait(pthread_cond_t * cond, pthread_mutex_t * mutex)
rval = pthread_mutex_lock(mutex);
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -197,7 +205,7 @@ pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * mutex,
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Set the wakeup time: */
_thread_run->wakeup_time.tv_sec = abstime->tv_sec;
@ -206,19 +214,24 @@ pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * mutex,
/* Reset the timeout flag: */
_thread_run->timeout = 0;
/* Queue the running thread for the condition variable: */
/*
* Queue the running thread for the condition
* variable:
*/
_thread_queue_enq(&(*cond)->c_queue, _thread_run);
/* Unlock the mutex: */
if ((rval = pthread_mutex_unlock(mutex)) != 0) {
/*
* Cannot unlock the mutex, so remove the running
* thread from the condition variable queue:
* Cannot unlock the mutex, so remove the
* running thread from the condition
* variable queue:
*/
_thread_queue_deq(&(*cond)->c_queue);
} else {
/* Schedule the next thread: */
_thread_kern_sched_state(PS_COND_WAIT, __FILE__, __LINE__);
_thread_kern_sched_state(PS_COND_WAIT,
__FILE__, __LINE__);
/* Block signals: */
_thread_kern_sig_block(NULL);
@ -235,7 +248,7 @@ pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * mutex,
}
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -267,7 +280,7 @@ pthread_cond_signal(pthread_cond_t * cond)
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Bring the next thread off the condition queue: */
if ((pthread = _thread_queue_deq(&(*cond)->c_queue)) != NULL) {
@ -276,7 +289,7 @@ pthread_cond_signal(pthread_cond_t * cond)
}
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -304,16 +317,20 @@ pthread_cond_broadcast(pthread_cond_t * cond)
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Enter a loop to bring all threads off the condition queue: */
while ((pthread = _thread_queue_deq(&(*cond)->c_queue)) != NULL) {
/*
* Enter a loop to bring all threads off the
* condition queue:
*/
while ((pthread =
_thread_queue_deq(&(*cond)->c_queue)) != NULL) {
/* Allow the thread to run: */
PTHREAD_NEW_STATE(pthread,PS_RUNNING);
}
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;

65
lib/libkse/thread/thr_cond.c
View File

@ -48,8 +48,8 @@ pthread_cond_init(pthread_cond_t * cond, const pthread_condattr_t * cond_attr)
rval = -1;
} else {
/*
* Check if a pointer to a condition variable attribute structure was
* passed by the caller:
* Check if a pointer to a condition variable attribute
* structure was passed by the caller:
*/
if (cond_attr != NULL && *cond_attr != NULL) {
/* Default to a fast condition variable: */
@ -61,12 +61,12 @@ pthread_cond_init(pthread_cond_t * cond, const pthread_condattr_t * cond_attr)
/* Process according to condition variable type: */
switch (type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Nothing to do here. */
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -76,7 +76,8 @@ pthread_cond_init(pthread_cond_t * cond, const pthread_condattr_t * cond_attr)
/* Check for no errors: */
if (rval == 0) {
if ((pcond = (pthread_cond_t) malloc(sizeof(struct pthread_cond))) == NULL) {
if ((pcond = (pthread_cond_t)
malloc(sizeof(struct pthread_cond))) == NULL) {
errno = ENOMEM;
rval = -1;
} else {
@ -106,12 +107,12 @@ pthread_cond_destroy(pthread_cond_t * cond)
} else {
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Nothing to do here. */
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -147,16 +148,23 @@ pthread_cond_wait(pthread_cond_t * cond, pthread_mutex_t * mutex)
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Queue the running thread for the condition variable: */
_thread_queue_enq(&(*cond)->c_queue, _thread_run);
/*
* Queue the running thread for the condition
* variable:
*/
_thread_queue_enq(&(*cond)->c_queue, _thread_run);
/* Unlock the mutex: */
pthread_mutex_unlock(mutex);
/* Wait forever: */
_thread_run->wakeup_time.tv_sec = -1;
/* Schedule the next thread: */
_thread_kern_sched_state(PS_COND_WAIT, __FILE__, __LINE__);
_thread_kern_sched_state(PS_COND_WAIT,
__FILE__, __LINE__);
/* Block signals: */
_thread_kern_sig_block(NULL);
@ -165,7 +173,7 @@ pthread_cond_wait(pthread_cond_t * cond, pthread_mutex_t * mutex)
rval = pthread_mutex_lock(mutex);
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -197,7 +205,7 @@ pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * mutex,
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Set the wakeup time: */
_thread_run->wakeup_time.tv_sec = abstime->tv_sec;
@ -206,19 +214,24 @@ pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * mutex,
/* Reset the timeout flag: */
_thread_run->timeout = 0;
/* Queue the running thread for the condition variable: */
/*
* Queue the running thread for the condition
* variable:
*/
_thread_queue_enq(&(*cond)->c_queue, _thread_run);
/* Unlock the mutex: */
if ((rval = pthread_mutex_unlock(mutex)) != 0) {
/*
* Cannot unlock the mutex, so remove the running
* thread from the condition variable queue:
* Cannot unlock the mutex, so remove the
* running thread from the condition
* variable queue:
*/
_thread_queue_deq(&(*cond)->c_queue);
} else {
/* Schedule the next thread: */
_thread_kern_sched_state(PS_COND_WAIT, __FILE__, __LINE__);
_thread_kern_sched_state(PS_COND_WAIT,
__FILE__, __LINE__);
/* Block signals: */
_thread_kern_sig_block(NULL);
@ -235,7 +248,7 @@ pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * mutex,
}
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -267,7 +280,7 @@ pthread_cond_signal(pthread_cond_t * cond)
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Bring the next thread off the condition queue: */
if ((pthread = _thread_queue_deq(&(*cond)->c_queue)) != NULL) {
@ -276,7 +289,7 @@ pthread_cond_signal(pthread_cond_t * cond)
}
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -304,16 +317,20 @@ pthread_cond_broadcast(pthread_cond_t * cond)
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Enter a loop to bring all threads off the condition queue: */
while ((pthread = _thread_queue_deq(&(*cond)->c_queue)) != NULL) {
/*
* Enter a loop to bring all threads off the
* condition queue:
*/
while ((pthread =
_thread_queue_deq(&(*cond)->c_queue)) != NULL) {
/* Allow the thread to run: */
PTHREAD_NEW_STATE(pthread,PS_RUNNING);
}
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;

65
lib/libpthread/thread/thr_cond.c
View File

@ -48,8 +48,8 @@ pthread_cond_init(pthread_cond_t * cond, const pthread_condattr_t * cond_attr)
rval = -1;
} else {
/*
* Check if a pointer to a condition variable attribute structure was
* passed by the caller:
* Check if a pointer to a condition variable attribute
* structure was passed by the caller:
*/
if (cond_attr != NULL && *cond_attr != NULL) {
/* Default to a fast condition variable: */
@ -61,12 +61,12 @@ pthread_cond_init(pthread_cond_t * cond, const pthread_condattr_t * cond_attr)
/* Process according to condition variable type: */
switch (type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Nothing to do here. */
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -76,7 +76,8 @@ pthread_cond_init(pthread_cond_t * cond, const pthread_condattr_t * cond_attr)
/* Check for no errors: */
if (rval == 0) {
if ((pcond = (pthread_cond_t) malloc(sizeof(struct pthread_cond))) == NULL) {
if ((pcond = (pthread_cond_t)
malloc(sizeof(struct pthread_cond))) == NULL) {
errno = ENOMEM;
rval = -1;
} else {
@ -106,12 +107,12 @@ pthread_cond_destroy(pthread_cond_t * cond)
} else {
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Nothing to do here. */
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -147,16 +148,23 @@ pthread_cond_wait(pthread_cond_t * cond, pthread_mutex_t * mutex)
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Queue the running thread for the condition variable: */
_thread_queue_enq(&(*cond)->c_queue, _thread_run);
/*
* Queue the running thread for the condition
* variable:
*/
_thread_queue_enq(&(*cond)->c_queue, _thread_run);
/* Unlock the mutex: */
pthread_mutex_unlock(mutex);
/* Wait forever: */
_thread_run->wakeup_time.tv_sec = -1;
/* Schedule the next thread: */
_thread_kern_sched_state(PS_COND_WAIT, __FILE__, __LINE__);
_thread_kern_sched_state(PS_COND_WAIT,
__FILE__, __LINE__);
/* Block signals: */
_thread_kern_sig_block(NULL);
@ -165,7 +173,7 @@ pthread_cond_wait(pthread_cond_t * cond, pthread_mutex_t * mutex)
rval = pthread_mutex_lock(mutex);
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -197,7 +205,7 @@ pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * mutex,
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Set the wakeup time: */
_thread_run->wakeup_time.tv_sec = abstime->tv_sec;
@ -206,19 +214,24 @@ pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * mutex,
/* Reset the timeout flag: */
_thread_run->timeout = 0;
/* Queue the running thread for the condition variable: */
/*
* Queue the running thread for the condition
* variable:
*/
_thread_queue_enq(&(*cond)->c_queue, _thread_run);
/* Unlock the mutex: */
if ((rval = pthread_mutex_unlock(mutex)) != 0) {
/*
* Cannot unlock the mutex, so remove the running
* thread from the condition variable queue:
* Cannot unlock the mutex, so remove the
* running thread from the condition
* variable queue:
*/
_thread_queue_deq(&(*cond)->c_queue);
} else {
/* Schedule the next thread: */
_thread_kern_sched_state(PS_COND_WAIT, __FILE__, __LINE__);
_thread_kern_sched_state(PS_COND_WAIT,
__FILE__, __LINE__);
/* Block signals: */
_thread_kern_sig_block(NULL);
@ -235,7 +248,7 @@ pthread_cond_timedwait(pthread_cond_t * cond, pthread_mutex_t * mutex,
}
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -267,7 +280,7 @@ pthread_cond_signal(pthread_cond_t * cond)
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Bring the next thread off the condition queue: */
if ((pthread = _thread_queue_deq(&(*cond)->c_queue)) != NULL) {
@ -276,7 +289,7 @@ pthread_cond_signal(pthread_cond_t * cond)
}
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;
@ -304,16 +317,20 @@ pthread_cond_broadcast(pthread_cond_t * cond)
/* Process according to condition variable type: */
switch ((*cond)->c_type) {
/* Fast condition variable: */
/* Fast condition variable: */
case COND_TYPE_FAST:
/* Enter a loop to bring all threads off the condition queue: */
while ((pthread = _thread_queue_deq(&(*cond)->c_queue)) != NULL) {
/*
* Enter a loop to bring all threads off the
* condition queue:
*/
while ((pthread =
_thread_queue_deq(&(*cond)->c_queue)) != NULL) {
/* Allow the thread to run: */
PTHREAD_NEW_STATE(pthread,PS_RUNNING);
}
break;
/* Trap invalid condition variable types: */
/* Trap invalid condition variable types: */
default:
/* Return an invalid argument error: */
errno = EINVAL;