AnimTestbed/3rdparty/ozz-animation/extern/glfw/lib/x11/x11_thread.c

504 lines
12 KiB
C

//========================================================================
// GLFW - An OpenGL framework
// Platform: X11/GLX
// API version: 2.7
// WWW: http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.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 "internal.h"
//************************************************************************
//**** GLFW internal functions ****
//************************************************************************
#ifdef _GLFW_HAS_PTHREAD
//========================================================================
// This is simply a "wrapper" for calling the user thread function.
//========================================================================
void * _glfwNewThread( void * arg )
{
GLFWthreadfun threadfun;
_GLFWthread *t;
pthread_t posixID;
// Get current thread ID
posixID = pthread_self();
// Enter critical section
ENTER_THREAD_CRITICAL_SECTION
// Loop through entire list of threads to find the matching POSIX
// thread ID
for( t = &_glfwThrd.First; t != NULL; t = t->Next )
{
if( t->PosixID == posixID )
{
break;
}
}
if( t == NULL )
{
LEAVE_THREAD_CRITICAL_SECTION
return NULL;
}
// Get user thread function pointer
threadfun = t->Function;
// Leave critical section
LEAVE_THREAD_CRITICAL_SECTION
// Call the user thread function
threadfun( arg );
// Remove thread from thread list
ENTER_THREAD_CRITICAL_SECTION
_glfwRemoveThread( t );
LEAVE_THREAD_CRITICAL_SECTION
// When the thread function returns, the thread will die...
return NULL;
}
#endif // _GLFW_HAS_PTHREAD
//************************************************************************
//**** Platform implementation functions ****
//************************************************************************
//========================================================================
// Create a new thread
//========================================================================
GLFWthread _glfwPlatformCreateThread( GLFWthreadfun fun, void *arg )
{
#ifdef _GLFW_HAS_PTHREAD
GLFWthread ID;
_GLFWthread *t;
int result;
// Enter critical section
ENTER_THREAD_CRITICAL_SECTION
// Create a new thread information memory area
t = (_GLFWthread *) malloc( sizeof(_GLFWthread) );
if( t == NULL )
{
// Leave critical section
LEAVE_THREAD_CRITICAL_SECTION
return -1;
}
// Get a new unique thread id
ID = _glfwThrd.NextID ++;
// Store thread information in the thread list
t->Function = fun;
t->ID = ID;
// Create thread
result = pthread_create(
&t->PosixID, // Thread handle
NULL, // Default thread attributes
_glfwNewThread, // Thread function (a wrapper function)
(void *)arg // Argument to thread is user argument
);
// Did the thread creation fail?
if( result != 0 )
{
free( (void *) t );
LEAVE_THREAD_CRITICAL_SECTION
return -1;
}
// Append thread to thread list
_glfwAppendThread( t );
// Leave critical section
LEAVE_THREAD_CRITICAL_SECTION
// Return the GLFW thread ID
return ID;
#else
return -1;
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Kill a thread. NOTE: THIS IS A VERY DANGEROUS OPERATION, AND SHOULD NOT
// BE USED EXCEPT IN EXTREME SITUATIONS!
//========================================================================
void _glfwPlatformDestroyThread( GLFWthread ID )
{
#ifdef _GLFW_HAS_PTHREAD
_GLFWthread *t;
// Enter critical section
ENTER_THREAD_CRITICAL_SECTION
// Get thread information pointer
t = _glfwGetThreadPointer( ID );
if( t == NULL )
{
LEAVE_THREAD_CRITICAL_SECTION
return;
}
// Simply murder the process, no mercy!
pthread_kill( t->PosixID, SIGKILL );
// Remove thread from thread list
_glfwRemoveThread( t );
// Leave critical section
LEAVE_THREAD_CRITICAL_SECTION
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Wait for a thread to die
//========================================================================
int _glfwPlatformWaitThread( GLFWthread ID, int waitmode )
{
#ifdef _GLFW_HAS_PTHREAD
pthread_t thread;
_GLFWthread *t;
// Enter critical section
ENTER_THREAD_CRITICAL_SECTION
// Get thread information pointer
t = _glfwGetThreadPointer( ID );
// Is the thread already dead?
if( t == NULL )
{
LEAVE_THREAD_CRITICAL_SECTION
return GL_TRUE;
}
// If got this far, the thread is alive => polling returns FALSE
if( waitmode == GLFW_NOWAIT )
{
LEAVE_THREAD_CRITICAL_SECTION
return GL_FALSE;
}
// Get thread handle
thread = t->PosixID;
// Leave critical section
LEAVE_THREAD_CRITICAL_SECTION
// Wait for thread to die
(void) pthread_join( thread, NULL );
return GL_TRUE;
#else
return GL_TRUE;
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Return the thread ID for the current thread
//========================================================================
GLFWthread _glfwPlatformGetThreadID( void )
{
#ifdef _GLFW_HAS_PTHREAD
_GLFWthread *t;
GLFWthread ID = -1;
pthread_t posixID;
// Get current thread ID
posixID = pthread_self();
// Enter critical section
ENTER_THREAD_CRITICAL_SECTION
// Loop through entire list of threads to find the matching POSIX
// thread ID
for( t = &_glfwThrd.First; t != NULL; t = t->Next )
{
if( t->PosixID == posixID )
{
ID = t->ID;
break;
}
}
// Leave critical section
LEAVE_THREAD_CRITICAL_SECTION
// Return the found GLFW thread identifier
return ID;
#else
return 0;
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Create a mutual exclusion object
//========================================================================
GLFWmutex _glfwPlatformCreateMutex( void )
{
#ifdef _GLFW_HAS_PTHREAD
pthread_mutex_t *mutex;
// Allocate memory for mutex
mutex = (pthread_mutex_t *) malloc( sizeof( pthread_mutex_t ) );
if( !mutex )
{
return NULL;
}
// Initialise a mutex object
(void) pthread_mutex_init( mutex, NULL );
// Cast to GLFWmutex and return
return (GLFWmutex) mutex;
#else
return (GLFWmutex) 0;
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Destroy a mutual exclusion object
//========================================================================
void _glfwPlatformDestroyMutex( GLFWmutex mutex )
{
#ifdef _GLFW_HAS_PTHREAD
// Destroy the mutex object
pthread_mutex_destroy( (pthread_mutex_t *) mutex );
// Free memory for mutex object
free( (void *) mutex );
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Request access to a mutex
//========================================================================
void _glfwPlatformLockMutex( GLFWmutex mutex )
{
#ifdef _GLFW_HAS_PTHREAD
// Wait for mutex to be released
(void) pthread_mutex_lock( (pthread_mutex_t *) mutex );
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Release a mutex
//========================================================================
void _glfwPlatformUnlockMutex( GLFWmutex mutex )
{
#ifdef _GLFW_HAS_PTHREAD
// Release mutex
pthread_mutex_unlock( (pthread_mutex_t *) mutex );
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Create a new condition variable object
//========================================================================
GLFWcond _glfwPlatformCreateCond( void )
{
#ifdef _GLFW_HAS_PTHREAD
pthread_cond_t *cond;
// Allocate memory for condition variable
cond = (pthread_cond_t *) malloc( sizeof(pthread_cond_t) );
if( !cond )
{
return NULL;
}
// Initialise condition variable
(void) pthread_cond_init( cond, NULL );
// Cast to GLFWcond and return
return (GLFWcond) cond;
#else
return (GLFWcond) 0;
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Destroy a condition variable object
//========================================================================
void _glfwPlatformDestroyCond( GLFWcond cond )
{
#ifdef _GLFW_HAS_PTHREAD
// Destroy the condition variable object
(void) pthread_cond_destroy( (pthread_cond_t *) cond );
// Free memory for condition variable object
free( (void *) cond );
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Wait for a condition to be raised
//========================================================================
void _glfwPlatformWaitCond( GLFWcond cond, GLFWmutex mutex,
double timeout )
{
#ifdef _GLFW_HAS_PTHREAD
struct timeval currenttime;
struct timespec wait;
long dt_sec, dt_usec;
// Select infinite or timed wait
if( timeout >= GLFW_INFINITY )
{
// Wait for condition (infinite wait)
(void) pthread_cond_wait( (pthread_cond_t *) cond,
(pthread_mutex_t *) mutex );
}
else
{
// Set timeout time, relatvie to current time
gettimeofday( &currenttime, NULL );
dt_sec = (long) timeout;
dt_usec = (long) ((timeout - (double)dt_sec) * 1000000.0);
wait.tv_nsec = (currenttime.tv_usec + dt_usec) * 1000L;
if( wait.tv_nsec > 1000000000L )
{
wait.tv_nsec -= 1000000000L;
dt_sec ++;
}
wait.tv_sec = currenttime.tv_sec + dt_sec;
// Wait for condition (timed wait)
(void) pthread_cond_timedwait( (pthread_cond_t *) cond,
(pthread_mutex_t *) mutex, &wait );
}
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Signal a condition to one waiting thread
//========================================================================
void _glfwPlatformSignalCond( GLFWcond cond )
{
#ifdef _GLFW_HAS_PTHREAD
// Signal condition
(void) pthread_cond_signal( (pthread_cond_t *) cond );
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Broadcast a condition to all waiting threads
//========================================================================
void _glfwPlatformBroadcastCond( GLFWcond cond )
{
#ifdef _GLFW_HAS_PTHREAD
// Broadcast condition
(void) pthread_cond_broadcast( (pthread_cond_t *) cond );
#endif // _GLFW_HAS_PTHREAD
}
//========================================================================
// Return the number of processors in the system.
//========================================================================
int _glfwPlatformGetNumberOfProcessors( void )
{
int n;
// Get number of processors online
_glfw_numprocessors( n );
return n;
}