plibsys/src/pcondvariable-atheos.c at master · wizardst/plibsys · GitHub

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* The MIT License

* Permission is hereby granted, free of charge, to any person obtaining

* a copy of this software and associated documentation files (the

* 'Software'), to deal in the Software without restriction, including

* without limitation the rights to use, copy, modify, merge, publish,

* distribute, sublicense, and/or sell copies of the Software, and to

* permit persons to whom the Software is furnished to do so, subject to

* the following conditions:

* The above copyright notice and this permission notice shall be

* included in all copies or substantial portions of the Software.

* THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,

* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.

* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

#include "pcondvariable.h"

#include "pspinlock.h"

#include "patomic.h"

#include "pmem.h"

#include <stdlib.h>

#include <string.h>

#include <atheos/semaphore.h>

#include <atheos/threads.h>

typedef struct _PCondThread {

thread_id thread;

struct _PCondThread *next;

} PCondThread;

struct PCondVariable_ {

PSpinLock *lock;

PCondThread *wait_head;

pint wait_count;

};

P_LIB_API PCondVariable *

p_cond_variable_new (void)

{

PCondVariable *ret;

if (P_UNLIKELY ((ret = p_malloc0 (sizeof (PCondVariable))) == NULL)) {

P_ERROR ("PCondVariable::p_cond_variable_new: failed to allocate memory");

return NULL;

}

if ((ret->lock = p_spinlock_new ()) == NULL) {

P_ERROR ("PCondVariable::p_cond_variable_new: failed to initialize");

p_free (ret);

return NULL;

}

return ret;

}

P_LIB_API void

p_cond_variable_free (PCondVariable *cond)

{

if (P_UNLIKELY (cond == NULL))

return;

if ((cond->wait_count > 0) || (cond->wait_head != NULL))

P_WARNING ("PCondVariable::p_cond_variable_free: destroying while threads are waiting");

p_spinlock_free (cond->lock);

p_free (cond);

}

P_LIB_API pboolean

p_cond_variable_wait (PCondVariable *cond,

PMutex *mutex)

{

PCondThread *wait_thread;

if (P_UNLIKELY (cond == NULL || mutex == NULL))

return FALSE;

if ((wait_thread = p_malloc0 (sizeof (PCondThread))) == NULL) {

P_ERROR ("PCondVariable::p_cond_variable_wait: failed to allocate memory");

return FALSE;

}

wait_thread->thread = get_thread_id (NULL);

wait_thread->next = NULL;

if (p_spinlock_lock (cond->lock) != TRUE) {

P_ERROR ("PCondVariable::p_cond_variable_wait: failed to lock internal spinlock");

return FALSE;

}

if (cond->wait_head != NULL)

cond->wait_head->next = wait_thread;

else

cond->wait_head = wait_thread;

p_atomic_int_inc ((volatile pint *) &cond->wait_count);

if (p_spinlock_unlock (cond->lock) != TRUE) {

P_ERROR ("PCondVariable::p_cond_variable_wait: failed to unlock internal spinlock");

return FALSE;

}

if (p_mutex_unlock (mutex) != TRUE) {

P_ERROR ("PCondVariable::p_cond_variable_wait: failed to unlock mutex");

return FALSE;

}

suspend_thread (wait_thread->thread);

if (p_mutex_lock (mutex) != TRUE) {

P_ERROR ("PCondVariable::p_cond_variable_wait: failed to lock mutex");

return FALSE;

}

return TRUE;

}

P_LIB_API pboolean

p_cond_variable_signal (PCondVariable *cond)

{

PCondThread *wait_thread;

thread_info thr_info;

if (P_UNLIKELY (cond == NULL))

return FALSE;

if (p_spinlock_lock (cond->lock) != TRUE) {

P_ERROR ("PCondVariable::p_cond_variable_signal: failed to lock internal spinlock");

return FALSE;

}

if (cond->wait_head == NULL) {

if (p_spinlock_unlock (cond->lock) != TRUE) {

P_ERROR ("PCondVariable::p_cond_variable_signal(1): failed to unlock internal spinlock");

return FALSE;

} else

return TRUE;

}

wait_thread = cond->wait_head;

cond->wait_head = wait_thread->next;

p_atomic_int_add ((volatile pint *) &cond->wait_count, -1);

if (p_spinlock_unlock (cond->lock) != TRUE) {

P_ERROR ("PCondVariable::p_cond_variable_signal(2): failed to unlock internal spinlock");

return FALSE;

}

memset (&thr_info, 0, sizeof (thr_info));

while (get_thread_info (wait_thread->thread, &thr_info) == 0) {

if (thr_info.ti_state != TS_READY)

break;

}

resume_thread (wait_thread->thread);

p_free (wait_thread);

return TRUE;

}

P_LIB_API pboolean

p_cond_variable_broadcast (PCondVariable *cond)

{

if (P_UNLIKELY (cond == NULL))

return FALSE;

PCondThread *cur_thread;

PCondThread *next_thread;

thread_info thr_info;

if (p_spinlock_lock (cond->lock) != TRUE) {

P_ERROR ("PCondVariable::p_cond_variable_broadcast: failed to lock internal spinlock");

return FALSE;

}

if (cond->wait_head == NULL) {

if (p_spinlock_unlock (cond->lock) != TRUE) {

P_ERROR ("PCondVariable::p_cond_variable_broadcast(1): failed to unlock internal spinlock");

return FALSE;

} else

return TRUE;

}

cur_thread = cond->wait_head;

do {

memset (&thr_info, 0, sizeof (thr_info));

while (get_thread_info (cur_thread->thread, &thr_info) == 0) {

if (thr_info.ti_state != TS_READY)

break;

}

resume_thread (cur_thread->thread);

next_thread = cur_thread->next;

p_free (cur_thread);

cur_thread = next_thread;

} while (cur_thread != NULL);

cond->wait_head = NULL;

cond->wait_count = 0;

if (p_spinlock_unlock (cond->lock) != TRUE) {

P_ERROR ("PCondVariable::p_cond_variable_broadcast(2): failed to unlock internal spinlock");

return FALSE;

}

return TRUE;

}

void

p_cond_variable_init (void)

{

}

void

p_cond_variable_shutdown (void)

{

}

plibsys/src/pcondvariable-atheos.c at master · wizardst/plibsys · GitHub

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