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/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
/**
* @file src/gos/linux.c
* @brief GOS ChibiOS Operating System support.
*/
#include "gfx.h"
#if GFX_USE_OS_LINUX
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <time.h>
static gfxMutex SystemMutex;
void _gosInit(void)
{
gfxMutexInit(&SystemMutex);
}
void _gosDeinit(void)
{
/* ToDo */
}
void gfxSystemLock(void) {
gfxMutexEnter(&SystemMutex);
}
void gfxSystemUnlock(void) {
gfxMutexExit(&SystemMutex);
}
void gfxHalt(const char *msg) {
if (msg)
fprintf(stderr, "%s\n", msg);
exit(1);
}
void gfxSleepMilliseconds(delaytime_t ms) {
struct timespec ts;
switch(ms) {
case TIME_IMMEDIATE:
pthread_yield();
return;
case TIME_INFINITE:
while(1)
sleep(60);
return;
default:
ts.tv_sec = ms / 1000;
ts.tv_nsec = (ms % 1000) * 1000;
nanosleep(&ts, 0);
return;
}
}
void gfxSleepMicroseconds(delaytime_t ms) {
struct timespec ts;
switch(ms) {
case TIME_IMMEDIATE:
pthread_yield();
return;
case TIME_INFINITE:
while(1)
sleep(60);
return;
default:
ts.tv_sec = ms / 1000000;
ts.tv_nsec = ms % 1000000;
nanosleep(&ts, 0);
return;
}
}
systemticks_t gfxSystemTicks(void) {
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return ts.tv_sec * 1000UL + ts.tv_nsec / 1000UL;
}
gfxThreadHandle gfxThreadCreate(void *stackarea, size_t stacksz, threadpriority_t prio, DECLARE_THREAD_FUNCTION((*fn),p), void *param) {
gfxThreadHandle th;
// Implementing priority with pthreads is a rats nest that is also pthreads implementation dependent.
// Only some pthreads schedulers support it, some implementations use the operating system process priority mechanisms.
// Even those that do support it can have different ranges of priority and "normal" priority is an undefined concept.
// Across different UNIX style operating systems things can be very different (let alone OS's such as Windows).
// Even just Linux changes the way priority works with different kernel schedulers and across kernel versions.
// For these reasons we ignore the priority.
if (pthread_create(&th, 0, fn, param))
return 0;
return th;
}
threadreturn_t gfxThreadWait(gfxThreadHandle thread) {
threadreturn_t retval;
if (pthread_join(thread, &retval))
return 0;
return retval;
}
void gfxSemInit(gfxSem *pSem, semcount_t val, semcount_t limit) {
pthread_mutex_init(&pSem->mtx, 0);
pthread_cond_init(&pSem->cond, 0);
pthread_mutex_lock(&pSem->mtx);
pSem->cnt = val;
pSem->max = limit;
pthread_mutex_unlock(&pSem->mtx);
}
void gfxSemDestroy(gfxSem *pSem) {
pthread_mutex_destroy(&pSem->mtx);
pthread_cond_destroy(&pSem->cond);
}
bool_t gfxSemWait(gfxSem *pSem, delaytime_t ms) {
pthread_mutex_lock(&pSem->mtx);
switch (ms) {
case TIME_INFINITE:
while (!pSem->cnt)
pthread_cond_wait(&pSem->cond, &pSem->mtx);
break;
case TIME_IMMEDIATE:
if (!pSem->cnt) {
pthread_mutex_unlock(&pSem->mtx);
return FALSE;
}
break;
default:
{
struct timeval now;
struct timespec tm;
gettimeofday(&now);
tm.tv_sec = now.tv_sec + ms / 1000;
tm.tv_nsec = (now.tv_usec + ms % 1000) * 1000;
while (!pSem->cnt) {
if (pthread_cond_timedwait(&pSem->cond, &pSem->mtx, &tm) == ETIMEDOUT) {
pthread_mutex_unlock(&pSem->mtx);
return FALSE;
}
}
}
break;
}
pSem->cnt--;
pthread_mutex_unlock(&pSem->mtx);
return TRUE;
}
void gfxSemSignal(gfxSem *pSem) {
pthread_mutex_lock(&pSem->mtx);
if (pSem->cnt < pSem->max) {
pSem->cnt++;
pthread_cond_signal(&pSem->cond);
}
pthread_mutex_unlock(&pSem->mtx);
}
semcount_t gfxSemCounter(gfxSem *pSem) {
semcount_t res;
// The locking is really only required if obtaining the count is a divisible operation
// which it might be on a 8/16 bit processor with a 32 bit semaphore count.
pthread_mutex_lock(&pSem->mtx);
res = pSem->cnt;
pthread_mutex_unlock(&pSem->mtx);
return res;
}
#endif /* GFX_USE_OS_LINUX */
/** @} */
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