diff options
| -rw-r--r-- | include/gos/posix.h | 77 | ||||
| -rw-r--r-- | src/gos/posix.c | 151 |
2 files changed, 227 insertions, 1 deletions
diff --git a/include/gos/posix.h b/include/gos/posix.h index f81fb26b..732a7de3 100644 --- a/include/gos/posix.h +++ b/include/gos/posix.h @@ -14,6 +14,83 @@ #define _GOS_POSIX_H #if GFX_USE_OS_POSIX + +#include <sys/types.h> +#include <stdint.h> +#include <pthread.h> + +/* Already defined int8_t, uint8_t, int16_t, uint16_t, int32_t, uint32_t, size_t */ + +typedef int8_t bool_t; +typedef unsigned long systemticks_t; +typedef void * threadreturn_t; +typedef unsigned long delaytime_t; +typedef pthread_t gfxThreadHandle; +typedef int threadpriority_t; +typedef uint32_t semcount_t; +typedef pthread_mutex_t gfxMutex; + +#define DECLARE_THREAD_FUNCTION(fnName, param) threadreturn_t fnName(void *param) +#define DECLARE_THREAD_STACK(name, sz) uint8_t name[0]; + +#define gfxExit() exit(0) +#define gfxAlloc(sz) malloc(sz) +#define gfxRealloc(p,osz,nsz) realloc(p, nsz) +#define gfxFree(ptr) free(ptr) +#define gfxMillisecondsToTicks(ms) (ms) +#define gfxYield() pthread_yield() +#define gfxThreadMe() pthread_self() +#define gfxThreadClose(th) {} +#define gfxMutexInit(pmtx) pthread_mutex_init(pmtx, 0) +#define gfxMutexDestroy(pmtx) pthread_mutex_destroy(pmtx) +#define gfxMutexEnter(pmtx) pthread_mutex_lock(pmtx) +#define gfxMutexExit(pmtx) pthread_mutex_unlock(pmtx) +#define gfxSemSignalI(psem) gfxSemSignal(psem) +#define gfxSemCounterI(pSem) ((pSem)->cnt) + + +#define FALSE 0 +#define TRUE 1 +#define TIME_IMMEDIATE 0 +#define TIME_INFINITE ((delaytime_t)-1) +#define MAX_SEMAPHORE_COUNT ((semcount_t)-1) +#define LOW_PRIORITY 10 +#define NORMAL_PRIORITY 0 +#define HIGH_PRIORITY -10 + +typedef struct gfxSem { + pthread_mutex_t mtx; + pthread_cond_t cond; + semcount_t cnt; + semcount_t max; + } gfxSem; + +/*===========================================================================*/ +/* Function declarations. */ +/*===========================================================================*/ + +#ifdef __cplusplus +extern "C" { +#endif + +void gfxHalt(const char *msg); +void gfxSleepMilliseconds(delaytime_t ms); +void gfxSleepMicroseconds(delaytime_t ms); +systemticks_t gfxSystemTicks(void); +void gfxSystemLock(void); +void gfxSystemUnlock(void); +void gfxSemInit(gfxSem *psem, semcount_t val, semcount_t limit); +void gfxSemDestroy(gfxSem *psem); +bool_t gfxSemWait(gfxSem *psem, delaytime_t ms); +void gfxSemSignal(gfxSem *psem); +semcount_t gfxSemCounter(gfxSem *pSem); +gfxThreadHandle gfxThreadCreate(void *stackarea, size_t stacksz, threadpriority_t prio, DECLARE_THREAD_FUNCTION((*fn),p), void *param); +threadreturn_t gfxThreadWait(gfxThreadHandle thread); + +#ifdef __cplusplus +} +#endif + #endif /* GFX_USE_OS_POSIX */ #endif /* _GOS_POSIX_H */ diff --git a/src/gos/posix.c b/src/gos/posix.c index 19a02560..f48a4caa 100644 --- a/src/gos/posix.c +++ b/src/gos/posix.c @@ -13,7 +13,156 @@ #if GFX_USE_OS_POSIX -#error "GOS: POSIX not supported yet" +#include <stdio.h> +#include <unistd.h> +#include <time.h> + +static gfxMutex SystemMutex; + +void _gosInit(void) { + gfxMutexInit(&SystemMutex); +} + +void gfxSystemLock(void) { + gfxMutexEnter(&SystemMutex); +} + +void gfxSystemUnlock(void) { + gfxMutexLeave(&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->val) + pthread_cond_wait(&psem->cond, &psem->mtx); + break; + case TIME_IMMEDIATE: + if (!psem->val) { + 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->val) { + if (pthread_cond_timedwait(&psem->cond, &psem->mtx, &tm) == ETIMEDOUT) { + pthread_mutex_unlock(&psem->mtx); + return FALSE; + } + } + } + break; + } + psem->val--; + pthread_mutex_unlock(&psem->mtx); + return TRUE; +} + +void gfxSemSignal(gfxSem *psem) { + pthread_mutex_lock(&psem->mtx); + if (psem->val < psem->limit) { + psem->val++; + 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_POSIX */ /** @} */ |