Squashed 'externals/zycore/' content from commit 0c372cdef

git-subtree-dir: externals/zycore
git-subtree-split: 0c372cdefe799e99812c008a0b74537bfa5fe077

src/API/Synchronization.c

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+/***************************************************************************************************
+
+  Zyan Core Library (Zycore-C)
+
+  Original Author : Florian Bernd
+
+ * 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 <Zycore/API/Synchronization.h>
+
+/* ============================================================================================== */
+/* Internal functions                                                                             */
+/* ============================================================================================== */
+
+/* ---------------------------------------------------------------------------------------------- */
+/*                                                                                                */
+/* ---------------------------------------------------------------------------------------------- */
+
+
+
+/* ---------------------------------------------------------------------------------------------- */
+
+/* ============================================================================================== */
+/* Exported functions                                                                             */
+/* ============================================================================================== */
+
+#if   defined(ZYAN_POSIX)
+
+#include <errno.h>
+
+/* ---------------------------------------------------------------------------------------------- */
+/* Critical Section                                                                               */
+/* ---------------------------------------------------------------------------------------------- */
+
+ZyanStatus ZyanCriticalSectionInitialize(ZyanCriticalSection* critical_section)
+{
+    pthread_mutexattr_t attribute;
+
+    int error = pthread_mutexattr_init(&attribute);
+    if (error != 0)
+    {
+        if (error == ENOMEM)
+        {
+            return ZYAN_STATUS_NOT_ENOUGH_MEMORY;
+        }
+        return ZYAN_STATUS_BAD_SYSTEMCALL;
+    }
+    pthread_mutexattr_settype(&attribute, PTHREAD_MUTEX_RECURSIVE);
+
+    error = pthread_mutex_init(critical_section, &attribute);
+    pthread_mutexattr_destroy(&attribute);
+    if (error != 0)
+    {
+        if (error == EAGAIN)
+        {
+            return ZYAN_STATUS_OUT_OF_RESOURCES;
+        }
+        if (error == ENOMEM)
+        {
+            return ZYAN_STATUS_NOT_ENOUGH_MEMORY;
+        }
+        if (error == EPERM)
+        {
+            return ZYAN_STATUS_ACCESS_DENIED;
+        }
+        if ((error == EBUSY) || (error == EINVAL))
+        {
+            return ZYAN_STATUS_INVALID_ARGUMENT;
+        }
+        return ZYAN_STATUS_BAD_SYSTEMCALL;
+    }
+
+    return ZYAN_STATUS_SUCCESS;
+}
+
+ZyanStatus ZyanCriticalSectionEnter(ZyanCriticalSection* critical_section)
+{
+    const int error = pthread_mutex_lock(critical_section);
+    if (error != 0)
+    {
+        if (error == EINVAL)
+        {
+            return ZYAN_STATUS_INVALID_ARGUMENT;
+        }
+        if (error == EAGAIN)
+        {
+            return ZYAN_STATUS_INVALID_OPERATION;
+        }
+        return ZYAN_STATUS_BAD_SYSTEMCALL;
+    }
+
+    return ZYAN_STATUS_SUCCESS;
+}
+
+ZyanBool ZyanCriticalSectionTryEnter(ZyanCriticalSection* critical_section)
+{
+    // No fine grained error handling for this one
+    return pthread_mutex_trylock(critical_section) ? ZYAN_FALSE : ZYAN_TRUE;
+}
+
+ZyanStatus ZyanCriticalSectionLeave(ZyanCriticalSection* critical_section)
+{
+    const int error = pthread_mutex_unlock(critical_section);
+    if (error != 0)
+    {
+        if (error == EINVAL)
+        {
+            return ZYAN_STATUS_INVALID_ARGUMENT;
+        }
+        if (error == EPERM)
+        {
+            return ZYAN_STATUS_INVALID_OPERATION;
+        }
+        return ZYAN_STATUS_BAD_SYSTEMCALL;
+    }
+
+    return ZYAN_STATUS_SUCCESS;
+}
+
+ZyanStatus ZyanCriticalSectionDelete(ZyanCriticalSection* critical_section)
+{
+    const int error = pthread_mutex_destroy(critical_section);
+    if (error != 0)
+    {
+        if ((error == EBUSY) || (error == EINVAL))
+        {
+            return ZYAN_STATUS_INVALID_ARGUMENT;
+        }
+        return ZYAN_STATUS_BAD_SYSTEMCALL;
+    }
+
+    return ZYAN_STATUS_SUCCESS;
+}
+
+/* ---------------------------------------------------------------------------------------------- */
+
+#elif defined(ZYAN_WINDOWS)
+
+/* ---------------------------------------------------------------------------------------------- */
+/* General                                                                                        */
+/* ---------------------------------------------------------------------------------------------- */
+
+ZyanStatus ZyanCriticalSectionInitialize(ZyanCriticalSection* critical_section)
+{
+    InitializeCriticalSection(critical_section);
+
+    return ZYAN_STATUS_SUCCESS;
+}
+
+ZyanStatus ZyanCriticalSectionEnter(ZyanCriticalSection* critical_section)
+{
+    EnterCriticalSection(critical_section);
+
+    return ZYAN_STATUS_SUCCESS;
+}
+
+ZyanBool ZyanCriticalSectionTryEnter(ZyanCriticalSection* critical_section)
+{
+    return TryEnterCriticalSection(critical_section) ? ZYAN_TRUE : ZYAN_FALSE;
+}
+
+ZyanStatus ZyanCriticalSectionLeave(ZyanCriticalSection* critical_section)
+{
+    LeaveCriticalSection(critical_section);
+
+    return ZYAN_STATUS_SUCCESS;
+}
+
+ZyanStatus ZyanCriticalSectionDelete(ZyanCriticalSection* critical_section)
+{
+    DeleteCriticalSection(critical_section);
+
+    return ZYAN_STATUS_SUCCESS;
+}
+
+/* ---------------------------------------------------------------------------------------------- */
+
+#else
+#   error "Unsupported platform detected"
+#endif
+
+/* ============================================================================================== */