diff options
Diffstat (limited to 'src/gos/gos_linux.c')
-rw-r--r-- | src/gos/gos_linux.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/src/gos/gos_linux.c b/src/gos/gos_linux.c new file mode 100644 index 00000000..fc716ec9 --- /dev/null +++ b/src/gos/gos_linux.c @@ -0,0 +1,213 @@ +/* + * 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 + */ + +#include "gfx.h" + +#if GFX_USE_OS_LINUX + +// Linux seems to have deprecated pthread_yield() and now says to use sched_yield() +#define USE_SCHED_NOT_PTHREAD_YIELD TRUE + +#include <stdio.h> +#include <unistd.h> +#include <errno.h> +#include <sys/time.h> +#include <time.h> +#if USE_SCHED_NOT_PTHREAD_YIELD + #include <sched.h> + #define linuxyield() sched_yield() +#else + #define linuxyield() pthread_yield() +#endif + +static gfxMutex SystemMutex; + +void _gosInit(void) +{ + /* No initialization of the operating system itself is needed */ + gfxMutexInit(&SystemMutex); +} + +void _gosDeinit(void) +{ + /* ToDo */ +} + +void gfxSystemLock(void) { + gfxMutexEnter(&SystemMutex); +} + +void gfxSystemUnlock(void) { + gfxMutexExit(&SystemMutex); +} + +void gfxYield(void) { + linuxyield(); +} + +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: + linuxyield(); + 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: + linuxyield(); + 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; + (void) stackarea; + (void) stacksz; + (void) prio; + + // 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, 0); + 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 */ |