plibsys/src/pcondvariable-os2.c at master · abhisit/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 "patomic.h"

#include "pmem.h"

#include "pcondvariable.h"

#include <stdlib.h>

#define INCL_DOSSEMAPHORES

#define INCL_DOSERRORS

#include <os2.h>

struct PCondVariable_ {

HEV waiters_sema;

pint waiters_count;

pint signaled;

};

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 (P_UNLIKELY (DosCreateEventSem (NULL,

(PHEV) &ret->waiters_sema,

FALSE) != NO_ERROR)) {

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 (P_UNLIKELY (DosCloseEventSem (cond->waiters_sema) != NO_ERROR))

P_WARNING ("PCondVariable::p_cond_variable_free: DosCloseEventSem() failed");

p_free (cond);

}

P_LIB_API pboolean

p_cond_variable_wait (PCondVariable *cond,

PMutex *mutex)

{

APIRET ulrc;

APIRET reset_ulrc;

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

return FALSE;

do {

p_atomic_int_inc (&cond->waiters_count);

p_mutex_unlock (mutex);

do {

ULONG post_count;

ulrc = DosWaitEventSem (cond->waiters_sema, SEM_INDEFINITE_WAIT);

if (ulrc == NO_ERROR) {

reset_ulrc = DosResetEventSem (cond->waiters_sema, &post_count);

if (P_UNLIKELY (reset_ulrc != NO_ERROR &&

reset_ulrc != ERROR_ALREADY_RESET))

P_WARNING ("PCondVariable::p_cond_variable_wait: DosResetEventSem() failed");

}

} while (ulrc == NO_ERROR &&

p_atomic_int_compare_and_exchange (&cond->signaled, 1, 0) == FALSE);

p_atomic_int_add (&cond->waiters_count, -1);

p_mutex_lock (mutex);

} while (ulrc == ERROR_INTERRUPT);

return (ulrc == NO_ERROR) ? TRUE : FALSE;

}

P_LIB_API pboolean

p_cond_variable_signal (PCondVariable *cond)

{

pboolean result = TRUE;

if (P_UNLIKELY (cond == NULL))

return FALSE;

if (p_atomic_int_get (&cond->waiters_count) > 0) {

ULONG post_count;

APIRET ulrc;

p_atomic_int_set (&cond->signaled, 1);

ulrc = DosPostEventSem (cond->waiters_sema);

if (P_UNLIKELY (ulrc != NO_ERROR &&

ulrc != ERROR_ALREADY_POSTED &&

ulrc != ERROR_TOO_MANY_POSTS)) {

P_WARNING ("PCondVariable::p_cond_variable_signal: DosPostEventSem() failed");

result = FALSE;

}

return result;

}

P_LIB_API pboolean

p_cond_variable_broadcast (PCondVariable *cond)

{

if (P_UNLIKELY (cond == NULL))

return FALSE;

pboolean result = TRUE;

while (p_atomic_int_get (&cond->waiters_count) != 0) {

if (P_UNLIKELY (p_cond_variable_signal (cond) == FALSE))

result = FALSE;

}

return result;

}

void

p_cond_variable_init (void)

{

/* Not required */

}

void

p_cond_variable_shutdown (void)

{

/* Not required */

}

plibsys/src/pcondvariable-os2.c at master · abhisit/plibsys · GitHub

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