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StgSharp.Native/sdl-src/thread/ps2/SDL_syssem.c

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+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_PS2
+
+// Semaphore functions for the PS2.
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <kernel_util.h>
+
+#include <kernel.h>
+
+struct SDL_Semaphore
+{
+    s32 semid;
+};
+
+// Create a semaphore
+SDL_Semaphore *SDL_CreateSemaphore(Uint32 initial_value)
+{
+    SDL_Semaphore *sem;
+    ee_sema_t sema;
+
+    sem = (SDL_Semaphore *)SDL_malloc(sizeof(*sem));
+    if (sem) {
+        // TODO: Figure out the limit on the maximum value.
+        sema.init_count = initial_value;
+        sema.max_count = 255;
+        sema.option = 0;
+        sem->semid = CreateSema(&sema);
+
+        if (sem->semid < 0) {
+            SDL_SetError("Couldn't create semaphore");
+            SDL_free(sem);
+            sem = NULL;
+        }
+    }
+
+    return sem;
+}
+
+// Free the semaphore
+void SDL_DestroySemaphore(SDL_Semaphore *sem)
+{
+    if (sem) {
+        if (sem->semid > 0) {
+            DeleteSema(sem->semid);
+            sem->semid = 0;
+        }
+
+        SDL_free(sem);
+    }
+}
+
+bool SDL_WaitSemaphoreTimeoutNS(SDL_Semaphore *sem, Sint64 timeoutNS)
+{
+    u64 timeout_usec;
+    u64 *timeout_ptr;
+
+    if (!sem) {
+        return true;
+    }
+
+    if (timeoutNS == 0) {
+        return (PollSema(sem->semid) == 0);
+    }
+
+    timeout_ptr = NULL;
+
+    if (timeoutNS != -1) {  // -1 == wait indefinitely.
+        timeout_usec = SDL_NS_TO_US(timeoutNS);
+        timeout_ptr = &timeout_usec;
+    }
+
+    return (WaitSemaEx(sem->semid, 1, timeout_ptr) == 0);
+}
+
+// Returns the current count of the semaphore
+Uint32 SDL_GetSemaphoreValue(SDL_Semaphore *sem)
+{
+    ee_sema_t info;
+
+    if (!sem) {
+        return 0;
+    }
+
+    if (ReferSemaStatus(sem->semid, &info) == 0) {
+        return info.count;
+    }
+    return 0;
+}
+
+void SDL_SignalSemaphore(SDL_Semaphore *sem)
+{
+    if (!sem) {
+        return;
+    }
+
+    SignalSema(sem->semid);
+}
+
+#endif // SDL_THREAD_PS2