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authorsanine <sanine.not@pm.me>2022-08-27 23:52:56 -0500
committersanine <sanine.not@pm.me>2022-08-27 23:52:56 -0500
commita4dd0ad63c00f4dee3b86dfd3075d1d61b2b3180 (patch)
tree13bd5bfa15e6fea2a12f176bae79adf9c6fd0933 /3rdparty/plibsys/src/pcondvariable-win.c
parentbde3e4f1bb7b8f8abca0884a7d994ee1c17a66b1 (diff)
add plibsys
Diffstat (limited to '3rdparty/plibsys/src/pcondvariable-win.c')
-rw-r--r--3rdparty/plibsys/src/pcondvariable-win.c312
1 files changed, 312 insertions, 0 deletions
diff --git a/3rdparty/plibsys/src/pcondvariable-win.c b/3rdparty/plibsys/src/pcondvariable-win.c
new file mode 100644
index 0000000..0cf7dcb
--- /dev/null
+++ b/3rdparty/plibsys/src/pcondvariable-win.c
@@ -0,0 +1,312 @@
+/*
+ * The MIT License
+ *
+ * Copyright (C) 2010-2017 Alexander Saprykin <saprykin.spb@gmail.com>
+ *
+ * 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;
+}