57 lines
1005 B
C
57 lines
1005 B
C
#include <stdint.h>
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#include "rtos/context.h"
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#include "rtos/semaphore.h"
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#include "rtos/spinlock.h"
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uint8_t sem_wait(struct semaphore *sem)
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{
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uint32_t retval = CONTEXT_READY;
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spinlock_lock(&sem->lock);
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sem->count--;
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if (sem->count < 0)
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retval = context_wait_pri_queue(&sem->lock, &sem->sleep_queue);
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spinlock_unlock(&sem->lock);
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return retval;
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}
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void sem_post(struct semaphore *sem)
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{
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spinlock_lock(&sem->lock);
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sem->count++;
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if (sem->count <= 0)
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context_signal_queue(&sem->sleep_queue);
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spinlock_unlock(&sem->lock);
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}
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void sem_interrupt(struct semaphore *sem, struct context *c)
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{
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spinlock_lock(&sem->lock);
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context_interrupt_queue(c, &sem->sleep_queue);
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spinlock_unlock(&sem->lock);
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}
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int32_t sem_get_count(struct semaphore *sem)
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{
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int32_t retval;
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spinlock_lock(&sem->lock);
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retval = sem->count;
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spinlock_unlock(&sem->lock);
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return retval;
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}
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void sem_init(struct semaphore *sem, int32_t count)
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{
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sem->sleep_queue = 0;
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spinlock_init(&sem->lock);
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sem->count = 0;
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}
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