Changed directory structure to contain less symlinks so dependencies will get recalculated correctly by make

project/jni/sdl-1.3/src/thread/nds/SDL_syssem.c

@@ -0,0 +1,228 @@
+/*
+    SDL - Simple DirectMedia Layer
+    Copyright (C) 1997-2010 Sam Lantinga
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 of the License, or (at your option) any later version.
+
+    This library is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+    Sam Lantinga
+    slouken@libsdl.org
+*/
+
+#ifdef SAVE_RCSID
+static char rcsid =
+    "@(#) $Id: SDL_syssem.c,v 1.2 2001/04/26 16:50:18 hercules Exp $";
+#endif
+
+/* An implementation of semaphores using mutexes and condition variables */
+
+#include <stdlib.h>
+
+#include "SDL_error.h"
+#include "SDL_timer.h"
+#include "SDL_thread.h"
+#include "SDL_systhread_c.h"
+
+
+#ifdef DISABLE_THREADS
+
+SDL_sem *
+SDL_CreateSemaphore(Uint32 initial_value)
+{
+    SDL_SetError("SDL not configured with thread support");
+    return (SDL_sem *) 0;
+}
+
+void
+SDL_DestroySemaphore(SDL_sem * sem)
+{
+    return;
+}
+
+int
+SDL_SemTryWait(SDL_sem * sem)
+{
+    SDL_SetError("SDL not configured with thread support");
+    return -1;
+}
+
+int
+SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
+{
+    SDL_SetError("SDL not configured with thread support");
+    return -1;
+}
+
+int
+SDL_SemWait(SDL_sem * sem)
+{
+    SDL_SetError("SDL not configured with thread support");
+    return -1;
+}
+
+Uint32
+SDL_SemValue(SDL_sem * sem)
+{
+    return 0;
+}
+
+int
+SDL_SemPost(SDL_sem * sem)
+{
+    SDL_SetError("SDL not configured with thread support");
+    return -1;
+}
+
+#else
+
+struct SDL_semaphore
+{
+    Uint32 count;
+    Uint32 waiters_count;
+    SDL_mutex *count_lock;
+    SDL_cond *count_nonzero;
+};
+
+SDL_sem *
+SDL_CreateSemaphore(Uint32 initial_value)
+{
+    SDL_sem *sem;
+
+    sem = (SDL_sem *) malloc(sizeof(*sem));
+    if (!sem) {
+        SDL_OutOfMemory();
+        return (0);
+    }
+    sem->count = initial_value;
+    sem->waiters_count = 0;
+
+    sem->count_lock = SDL_CreateMutex();
+    sem->count_nonzero = SDL_CreateCond();
+    if (!sem->count_lock || !sem->count_nonzero) {
+        SDL_DestroySemaphore(sem);
+        return (0);
+    }
+
+    return (sem);
+}
+
+/* WARNING:
+   You cannot call this function when another thread is using the semaphore.
+*/
+void
+SDL_DestroySemaphore(SDL_sem * sem)
+{
+    if (sem) {
+        sem->count = 0xFFFFFFFF;
+        while (sem->waiters_count > 0) {
+            SDL_CondSignal(sem->count_nonzero);
+            SDL_Delay(10);
+        }
+        SDL_DestroyCond(sem->count_nonzero);
+        SDL_mutexP(sem->count_lock);
+        SDL_mutexV(sem->count_lock);
+        SDL_DestroyMutex(sem->count_lock);
+        free(sem);
+    }
+}
+
+int
+SDL_SemTryWait(SDL_sem * sem)
+{
+    int retval;
+
+    if (!sem) {
+        SDL_SetError("Passed a NULL semaphore");
+        return -1;
+    }
+
+    retval = SDL_MUTEX_TIMEDOUT;
+    SDL_LockMutex(sem->count_lock);
+    if (sem->count > 0) {
+        --sem->count;
+        retval = 0;
+    }
+    SDL_UnlockMutex(sem->count_lock);
+
+    return retval;
+}
+
+int
+SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
+{
+    int retval;
+
+    if (!sem) {
+        SDL_SetError("Passed a NULL semaphore");
+        return -1;
+    }
+
+    /* A timeout of 0 is an easy case */
+    if (timeout == 0) {
+        return SDL_SemTryWait(sem);
+    }
+
+    SDL_LockMutex(sem->count_lock);
+    ++sem->waiters_count;
+    retval = 0;
+    while ((sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT)) {
+        retval = SDL_CondWaitTimeout(sem->count_nonzero,
+                                     sem->count_lock, timeout);
+    }
+    --sem->waiters_count;
+    --sem->count;
+    SDL_UnlockMutex(sem->count_lock);
+
+    return retval;
+}
+
+int
+SDL_SemWait(SDL_sem * sem)
+{
+    return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
+}
+
+Uint32
+SDL_SemValue(SDL_sem * sem)
+{
+    Uint32 value;
+
+    value = 0;
+    if (sem) {
+        SDL_LockMutex(sem->count_lock);
+        value = sem->count;
+        SDL_UnlockMutex(sem->count_lock);
+    }
+    return value;
+}
+
+int
+SDL_SemPost(SDL_sem * sem)
+{
+    if (!sem) {
+        SDL_SetError("Passed a NULL semaphore");
+        return -1;
+    }
+
+    SDL_LockMutex(sem->count_lock);
+    if (sem->waiters_count > 0) {
+        SDL_CondSignal(sem->count_nonzero);
+    }
+    ++sem->count;
+    SDL_UnlockMutex(sem->count_lock);
+
+    return 0;
+}
+
+#endif /* DISABLE_THREADS */