add plibsys

1 files changed, 163 insertions, 0 deletions

diff --git a/3rdparty/plibsys/src/pcondvariable-os2.c b/3rdparty/plibsys/src/pcondvariable-os2.c
new file mode 100644
index 0000000..e3f0b0c
--- /dev/null
+++ b/3rdparty/plibsys/src/pcondvariable-os2.c
@@ -0,0 +1,163 @@
+/*
+ * The MIT License
+ *
+ * Copyright (C) 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.
+ */
+
+#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,
+					   0,
+					   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)
+{
+}
+
+void
+p_cond_variable_shutdown (void)
+{
+}