plibsys/src/pcondvariable-win.c at master · brightprogrammer/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.

/* Taken from "Strategies for Implementing POSIX Condition Variables on Win32"

* by Douglas C. Schmidt and Irfan Pyarali.

* See: http://www.cse.wustl.edu/~schmidt/win32-cv-1.html

* See: https://github.com/python/cpython/blob/master/Python/condvar.h

#include "patomic.h"

#include "pmem.h"

#include "pcondvariable.h"

#include <stdlib.h>

typedef VOID (WINAPI * InitializeConditionVariableFunc) (ppointer cv);

typedef BOOL (WINAPI * SleepConditionVariableCSFunc) (ppointer cv, PCRITICAL_SECTION cs, DWORD ms);

typedef VOID (WINAPI * WakeConditionVariableFunc) (ppointer cv);

typedef VOID (WINAPI * WakeAllConditionVariableFunc) (ppointer cv);

typedef pboolean (* PWin32CondInit) (PCondVariable *cond);

typedef void (* PWin32CondClose) (PCondVariable *cond);

typedef pboolean (* PWin32CondWait) (PCondVariable *cond, PMutex *mutex);

typedef pboolean (* PWin32CondSignal) (PCondVariable *cond);

typedef pboolean (* PWin32CondBrdcast) (PCondVariable *cond);

static PWin32CondInit pp_cond_variable_init_func = NULL;

static PWin32CondClose pp_cond_variable_close_func = NULL;

static PWin32CondWait pp_cond_variable_wait_func = NULL;

static PWin32CondSignal pp_cond_variable_signal_func = NULL;

static PWin32CondBrdcast pp_cond_variable_brdcast_func = NULL;

typedef struct PCondVariableVistaTable_ {

InitializeConditionVariableFunc cv_init;

SleepConditionVariableCSFunc cv_wait;

WakeConditionVariableFunc cv_wake;

WakeAllConditionVariableFunc cv_brdcast;

} PCondVariableVistaTable;

typedef struct PCondVariableXP_ {

HANDLE waiters_sema;

pint waiters_count;

} PCondVariableXP;

struct PCondVariable_ {

ppointer cv;

};

static PCondVariableVistaTable pp_cond_variable_vista_table = {NULL, NULL, NULL, NULL};

/* CONDITION_VARIABLE routines */

static pboolean pp_cond_variable_init_vista (PCondVariable *cond);

static void pp_cond_variable_close_vista (PCondVariable *cond);

static pboolean pp_cond_variable_wait_vista (PCondVariable *cond, PMutex *mutex);

static pboolean pp_cond_variable_signal_vista (PCondVariable *cond);

static pboolean pp_cond_variable_broadcast_vista (PCondVariable *cond);

/* Windows XP emulation routines */

static pboolean pp_cond_variable_init_xp (PCondVariable *cond);

static void pp_cond_variable_close_xp (PCondVariable *cond);

static pboolean pp_cond_variable_wait_xp (PCondVariable *cond, PMutex *mutex);

static pboolean pp_cond_variable_signal_xp (PCondVariable *cond);

static pboolean pp_cond_variable_broadcast_xp (PCondVariable *cond);

/* CONDITION_VARIABLE routines */

static pboolean

pp_cond_variable_init_vista (PCondVariable *cond)

{

pp_cond_variable_vista_table.cv_init (cond);

return TRUE;

}

static void

pp_cond_variable_close_vista (PCondVariable *cond)

{

P_UNUSED (cond);

}

static pboolean

pp_cond_variable_wait_vista (PCondVariable *cond, PMutex *mutex)

{

return pp_cond_variable_vista_table.cv_wait (cond,

(PCRITICAL_SECTION) mutex,

INFINITE) != 0 ? TRUE : FALSE;

}

static pboolean

pp_cond_variable_signal_vista (PCondVariable *cond)

{

pp_cond_variable_vista_table.cv_wake (cond);

return TRUE;

}

static pboolean

pp_cond_variable_broadcast_vista (PCondVariable *cond)

{

pp_cond_variable_vista_table.cv_brdcast (cond);

return TRUE;

}

/* Windows XP emulation routines */

static pboolean

pp_cond_variable_init_xp (PCondVariable *cond)

{

PCondVariableXP *cv_xp;

if ((cond->cv = p_malloc0 (sizeof (PCondVariableXP))) == NULL) {

P_ERROR ("PCondVariable::pp_cond_variable_init_xp: failed to allocate memory (internal)");

return FALSE;

}

cv_xp = ((PCondVariableXP *) cond->cv);

cv_xp->waiters_count = 0;

cv_xp->waiters_sema = CreateSemaphoreA (NULL, 0, MAXLONG, NULL);

if (P_UNLIKELY (cv_xp->waiters_sema == NULL)) {

P_ERROR ("PCondVariable::pp_cond_variable_init_xp: failed to initialize semaphore");

p_free (cond->cv);

cond->cv = NULL;

return FALSE;

}

return TRUE;

}

static void

pp_cond_variable_close_xp (PCondVariable *cond)

{

CloseHandle (((PCondVariableXP *) cond->cv)->waiters_sema);

p_free (cond->cv);

}

static pboolean

pp_cond_variable_wait_xp (PCondVariable *cond, PMutex *mutex)

{

PCondVariableXP *cv_xp = ((PCondVariableXP *) cond->cv);

DWORD wait;

p_atomic_int_inc (&cv_xp->waiters_count);

p_mutex_unlock (mutex);

wait = WaitForSingleObjectEx (cv_xp->waiters_sema, INFINITE, FALSE);

p_mutex_lock (mutex);

if (wait != WAIT_OBJECT_0)

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

return wait == WAIT_OBJECT_0 ? TRUE : FALSE;

}

static pboolean

pp_cond_variable_signal_xp (PCondVariable *cond)

{

PCondVariableXP *cv_xp = ((PCondVariableXP *) cond->cv);

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

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

return ReleaseSemaphore (cv_xp->waiters_sema, 1, 0) != 0 ? TRUE : FALSE;

}

return TRUE;

}

static pboolean

pp_cond_variable_broadcast_xp (PCondVariable *cond)

{

PCondVariableXP *cv_xp = ((PCondVariableXP *) cond->cv);

pint waiters;

waiters = p_atomic_int_get (&cv_xp->waiters_count);

if (waiters > 0) {

p_atomic_int_set (&cv_xp->waiters_count, 0);

return ReleaseSemaphore (cv_xp->waiters_sema, waiters, 0) != 0 ? TRUE : FALSE;

}

return TRUE;

}

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 (pp_cond_variable_init_func (ret) != TRUE)) {

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;

pp_cond_variable_close_func (cond);

p_free (cond);

}

P_LIB_API pboolean

p_cond_variable_wait (PCondVariable *cond,

PMutex *mutex)

{

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

return FALSE;

return pp_cond_variable_wait_func (cond, mutex);

}

P_LIB_API pboolean

p_cond_variable_signal (PCondVariable *cond)

{

if (P_UNLIKELY (cond == NULL))

return FALSE;

return pp_cond_variable_signal_func (cond);

}

P_LIB_API pboolean

p_cond_variable_broadcast (PCondVariable *cond)

{

if (P_UNLIKELY (cond == NULL))

return FALSE;

return pp_cond_variable_brdcast_func (cond);

}

void

p_cond_variable_init (void)

{

HMODULE hmodule;

hmodule = GetModuleHandleA ("kernel32.dll");

if (P_UNLIKELY (hmodule == NULL)) {

P_ERROR ("PCondVariable::p_cond_variable_init: failed to load kernel32.dll module");

return;

}

pp_cond_variable_vista_table.cv_init = (InitializeConditionVariableFunc) GetProcAddress (hmodule,

"InitializeConditionVariable");

if (P_LIKELY (pp_cond_variable_vista_table.cv_init != NULL)) {

pp_cond_variable_vista_table.cv_wait = (SleepConditionVariableCSFunc) GetProcAddress (hmodule,

"SleepConditionVariableCS");

pp_cond_variable_vista_table.cv_wake = (WakeConditionVariableFunc) GetProcAddress (hmodule,

"WakeConditionVariable");

pp_cond_variable_vista_table.cv_brdcast = (WakeAllConditionVariableFunc) GetProcAddress (hmodule,

"WakeAllConditionVariable");

pp_cond_variable_init_func = pp_cond_variable_init_vista;

pp_cond_variable_close_func = pp_cond_variable_close_vista;

pp_cond_variable_wait_func = pp_cond_variable_wait_vista;

pp_cond_variable_signal_func = pp_cond_variable_signal_vista;

pp_cond_variable_brdcast_func = pp_cond_variable_broadcast_vista;

} else {

pp_cond_variable_init_func = pp_cond_variable_init_xp;

pp_cond_variable_close_func = pp_cond_variable_close_xp;

pp_cond_variable_wait_func = pp_cond_variable_wait_xp;

pp_cond_variable_signal_func = pp_cond_variable_signal_xp;

pp_cond_variable_brdcast_func = pp_cond_variable_broadcast_xp;

}

void

p_cond_variable_shutdown (void)

{

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

pp_cond_variable_init_func = NULL;

pp_cond_variable_close_func = NULL;

pp_cond_variable_wait_func = NULL;

pp_cond_variable_signal_func = NULL;

pp_cond_variable_brdcast_func = NULL;

}

plibsys/src/pcondvariable-win.c at master · brightprogrammer/plibsys · GitHub

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