63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
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#ifndef __LIB_PTHREAD_H__
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# define __LIB_PTHREAD_H__
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#include <stddef.h>
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#include <stdint.h>
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// Define Mutex type
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enum
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{
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mtx_plain = 0,
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mtx_recursive = 1,
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mtx_timed = 2
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};
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// Define mutex structure
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#define MTX_WATERMARK (0xdeadbeef)
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struct __mtx_s
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{
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uint32_t __watermark;
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uint16_t lock;
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uint8_t type;
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} __attribute__((packed, aligned(4)));
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typedef struct __mtx_s mtx_t;
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//
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// Mutex functions
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//
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// Creates a new mutex object with type __TYPE.
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// @note: If successful the new object is pointed by __MUTEX.
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extern int mtx_init(mtx_t *__mutex, int __type);
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// Block the current thread until the mutex pointed to by __MUTEX is unlocked.
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// In that case current thread will not be blocked.
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extern int mtx_lock(mtx_t *__mutex);
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// Try to lock the mutex pointed by __MUTEX without blocking.
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// @note: If the mutex is free the current threads takes control of it,
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// otherwise it returns immediately.
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extern int mtx_trylock(mtx_t *__mutex);
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// Unlock the mutex pointed by __MUTEX.
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// @note: It may potentially awake other threads waiting on this mutex.
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extern int mtx_unlock (mtx_t *__mutex);
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// Destroy the mutex object pointed by __MUTEX.
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extern void mtx_destroy(mtx_t *__mutex);
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//
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// Atomic operations
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//
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// Save the current SR register and set the SR.BIT bit up (start atomic operations)
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// @note: return the saved SR register (if has been saved), 0xffffffff otherwise.
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extern uint32_t __thread_atomic_start(void);
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// Restore the saved SR register
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// @note: return the restored SR register or -1 otherwise.
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extern uint32_t __thread_atomic_stop(void);
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#endif /*__LIB_PTHREAD_H__*/
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