os.h

基于sip协议的网络电话源码

 * @return	    PJ_SUCCESS on success, or the error code.
 */
PJ_DECL(pj_status_t) pj_rwmutex_unlock_write(pj_rwmutex_t *mutex);

/**
 * Destroy reader/writer mutex.
 *
 * @param mutex	    The mutex.
 * @return	    PJ_SUCCESS on success, or the error code.
 */
PJ_DECL(pj_status_t) pj_rwmutex_destroy(pj_rwmutex_t *mutex);


/**
 * @}
 */


/* **************************************************************************/
/**
 * @defgroup PJ_CRIT_SEC Critical sections.
 * @ingroup PJ_OS
 * @{
 * Critical section protection can be used to protect regions where:
 *  - mutual exclusion protection is needed.
 *  - it's rather too expensive to create a mutex.
 *  - the time spent in the region is very very brief.
 *
 * Critical section is a global object, and it prevents any threads from
 * entering any regions that are protected by critical section once a thread
 * is already in the section.
 *
 * Critial section is \a not recursive!
 *
 * Application <b>MUST NOT</b> call any functions that may cause current
 * thread to block (such as allocating memory, performing I/O, locking mutex,
 * etc.) while holding the critical section.
 */
/**
 * Enter critical section.
 */
PJ_DECL(void) pj_enter_critical_section(void);

/**
 * Leave critical section.
 */
PJ_DECL(void) pj_leave_critical_section(void);

/**
 * @}
 */

/* **************************************************************************/
#if defined(PJ_HAS_SEMAPHORE) && PJ_HAS_SEMAPHORE != 0
/**
 * @defgroup PJ_SEM Semaphores.
 * @ingroup PJ_OS
 * @{
 *
 * This module provides abstraction for semaphores, where available.
 */

/**
 * Create semaphore.
 *
 * @param pool	    The pool.
 * @param name	    Name to be assigned to the semaphore (for logging purpose)
 * @param initial   The initial count of the semaphore.
 * @param max	    The maximum count of the semaphore.
 * @param sem	    Pointer to hold the semaphore created.
 *
 * @return	    PJ_SUCCESS on success, or the error code.
 */
PJ_DECL(pj_status_t) pj_sem_create( pj_pool_t *pool, 
                                    const char *name,
				    unsigned initial, 
                                    unsigned max,
				    pj_sem_t **sem);

/**
 * Wait for semaphore.
 *
 * @param sem	The semaphore.
 *
 * @return	PJ_SUCCESS on success, or the error code.
 */
PJ_DECL(pj_status_t) pj_sem_wait(pj_sem_t *sem);

/**
 * Try wait for semaphore.
 *
 * @param sem	The semaphore.
 *
 * @return	PJ_SUCCESS on success, or the error code.
 */
PJ_DECL(pj_status_t) pj_sem_trywait(pj_sem_t *sem);

/**
 * Release semaphore.
 *
 * @param sem	The semaphore.
 *
 * @return	PJ_SUCCESS on success, or the error code.
 */
PJ_DECL(pj_status_t) pj_sem_post(pj_sem_t *sem);

/**
 * Destroy semaphore.
 *
 * @param sem	The semaphore.
 *
 * @return	PJ_SUCCESS on success, or the error code.
 */
PJ_DECL(pj_status_t) pj_sem_destroy(pj_sem_t *sem);

/**
 * @}
 */
#endif	/* PJ_HAS_SEMAPHORE */


/* **************************************************************************/
#if defined(PJ_HAS_EVENT_OBJ) && PJ_HAS_EVENT_OBJ != 0
/**
 * @defgroup PJ_EVENT Event Object.
 * @ingroup PJ_OS
 * @{
 *
 * This module provides abstraction to event object (e.g. Win32 Event) where
 * available. Event objects can be used for synchronization among threads.
 */

/**
 * Create event object.
 *
 * @param pool		The pool.
 * @param name		The name of the event object (for logging purpose).
 * @param manual_reset	Specify whether the event is manual-reset
 * @param initial	Specify the initial state of the event object.
 * @param event		Pointer to hold the returned event object.
 *
 * @return event handle, or NULL if failed.
 */
PJ_DECL(pj_status_t) pj_event_create(pj_pool_t *pool, const char *name,
				     pj_bool_t manual_reset, pj_bool_t initial,
				     pj_event_t **event);

/**
 * Wait for event to be signaled.
 *
 * @param event	    The event object.
 *
 * @return zero if successfull.
 */
PJ_DECL(pj_status_t) pj_event_wait(pj_event_t *event);

/**
 * Try wait for event object to be signalled.
 *
 * @param event The event object.
 *
 * @return zero if successfull.
 */
PJ_DECL(pj_status_t) pj_event_trywait(pj_event_t *event);

/**
 * Set the event object state to signaled. For auto-reset event, this 
 * will only release the first thread that are waiting on the event. For
 * manual reset event, the state remains signaled until the event is reset.
 * If there is no thread waiting on the event, the event object state 
 * remains signaled.
 *
 * @param event	    The event object.
 *
 * @return zero if successfull.
 */
PJ_DECL(pj_status_t) pj_event_set(pj_event_t *event);

/**
 * Set the event object to signaled state to release appropriate number of
 * waiting threads and then reset the event object to non-signaled. For
 * manual-reset event, this function will release all waiting threads. For
 * auto-reset event, this function will only release one waiting thread.
 *
 * @param event	    The event object.
 *
 * @return zero if successfull.
 */
PJ_DECL(pj_status_t) pj_event_pulse(pj_event_t *event);

/**
 * Set the event object state to non-signaled.
 *
 * @param event	    The event object.
 *
 * @return zero if successfull.
 */
PJ_DECL(pj_status_t) pj_event_reset(pj_event_t *event);

/**
 * Destroy the event object.
 *
 * @param event	    The event object.
 *
 * @return zero if successfull.
 */
PJ_DECL(pj_status_t) pj_event_destroy(pj_event_t *event);

/**
 * @}
 */
#endif	/* PJ_HAS_EVENT_OBJ */

/* **************************************************************************/
/**
 * @addtogroup PJ_TIME Time Data Type and Manipulation.
 * @ingroup PJ_OS
 * @{
 * This module provides API for manipulating time.
 *
 * \section pj_time_examples_sec Examples
 *
 * For examples, please see:
 *  - \ref page_pjlib_sleep_test
 */

/**
 * Get current time of day in local representation.
 *
 * @param tv	Variable to store the result.
 *
 * @return zero if successfull.
 */
PJ_DECL(pj_status_t) pj_gettimeofday(pj_time_val *tv);


/**
 * Parse time value into date/time representation.
 *
 * @param tv	The time.
 * @param pt	Variable to store the date time result.
 *
 * @return zero if successfull.
 */
PJ_DECL(pj_status_t) pj_time_decode(const pj_time_val *tv, pj_parsed_time *pt);

/**
 * Encode date/time to time value.
 *
 * @param pt	The date/time.
 * @param tv	Variable to store time value result.
 *
 * @return zero if successfull.
 */
PJ_DECL(pj_status_t) pj_time_encode(const pj_parsed_time *pt, pj_time_val *tv);

/**
 * Convert local time to GMT.
 *
 * @param tv	Time to convert.
 *
 * @return zero if successfull.
 */
PJ_DECL(pj_status_t) pj_time_local_to_gmt(pj_time_val *tv);

/**
 * Convert GMT to local time.
 *
 * @param tv	Time to convert.
 *
 * @return zero if successfull.
 */
PJ_DECL(pj_status_t) pj_time_gmt_to_local(pj_time_val *tv);

/**
 * @}
 */

/* **************************************************************************/
#if defined(PJ_TERM_HAS_COLOR) && PJ_TERM_HAS_COLOR != 0

/**
 * @defgroup PJ_TERM Terminal
 * @ingroup PJ_OS
 * @{
 */

/**
 * Set current terminal color.
 *
 * @param color	    The RGB color.
 *
 * @return zero on success.
 */
PJ_DECL(pj_status_t) pj_term_set_color(pj_color_t color);

/**
 * Get current terminal foreground color.
 *
 * @return RGB color.
 */
PJ_DECL(pj_color_t) pj_term_get_color(void);

/**
 * @}
 */

#endif	/* PJ_TERM_HAS_COLOR */

/* **************************************************************************/
/**
 * @defgroup PJ_TIMESTAMP High Resolution Timestamp
 * @ingroup PJ_OS
 * @{
 *
 * PJLIB provides <b>High Resolution Timestamp</b> API to access highest 
 * resolution timestamp value provided by the platform. The API is usefull
 * to measure precise elapsed time, and can be used in applications such
 * as profiling.
 *
 * The timestamp value is represented in cycles, and can be related to
 * normal time (in seconds or sub-seconds) using various functions provided.
 *
 * \section pj_timestamp_examples_sec Examples
 *
 * For examples, please see:
 *  - \ref page_pjlib_sleep_test
 *  - \ref page_pjlib_timestamp_test
 */

/*
 * High resolution timer.
 */
#if defined(PJ_HAS_HIGH_RES_TIMER) && PJ_HAS_HIGH_RES_TIMER != 0

/**
 * Acquire high resolution timer value. The time value are stored
 * in cycles.
 *
 * @param ts	    High resolution timer value.
 * @return	    PJ_SUCCESS or the appropriate error code.
 *
 * @see pj_get_timestamp_freq().
 */
PJ_DECL(pj_status_t) pj_get_timestamp(pj_timestamp *ts);

/**
 * Get high resolution timer frequency, in cycles per second.
 *
 * @param freq	    Timer frequency, in cycles per second.
 * @return	    PJ_SUCCESS or the appropriate error code.
 */
PJ_DECL(pj_status_t) pj_get_timestamp_freq(pj_timestamp *freq);

/**
 * Set timestamp from 32bit values.
 * @param t	    The timestamp to be set.
 * @param hi	    The high 32bit part.
 * @param lo	    The low 32bit part.
 */
PJ_INLINE(void) pj_set_timestamp32(pj_timestamp *t, pj_uint32_t hi,
				   pj_uint32_t lo)
{
    t->u32.hi = hi;
    t->u32.lo = lo;
}

/**
 * Add timestamp t2 to t1.
 * @param t1	    t1.
 * @param t2	    t2.
 */
PJ_INLINE(void) pj_add_timestamp(pj_timestamp *t1, const pj_timestamp *t2)
{
#if PJ_HAS_INT64
    t1->u64 += t2->u64;
#else
    pj_uint32_t old = t1->u32.lo;
    t1->u32.hi += t2->u32.hi;
    t1->u32.lo += t2->u32.lo;
    if (t1->u32.lo < old)
	++t1->u32.hi;
#endif
}

/**
 * Add timestamp t2 to t1.
 * @param t1	    t1.
 * @param t2	    t2.
 */
PJ_INLINE(void) pj_add_timestamp32(pj_timestamp *t1, pj_uint32_t t2)
{
#if PJ_HAS_INT64
    t1->u64 += t2;
#else
    pj_uint32_t old = t1->u32.lo;
    t1->u32.lo += t2;
    if (t1->u32.lo < old)
	++t1->u32.hi;
#endif
}

/**
 * Substract timestamp t2 from t1.
 * @param t1	    t1.
 * @param t2	    t2.
 */
PJ_INLINE(void) pj_sub_timestamp(pj_timestamp *t1, const pj_timestamp *t2)
{
#if PJ_HAS_INT64
    t1->u64 -= t2->u64;
#else
    t1->u32.hi -= t2->u32.hi;
    if (t1->u32.lo >= t2->u32.lo)
	t1->u32.lo -= t2->u32.lo;
    else {
	t1->u32.lo -= t2->u32.lo;
	--t1->u32.hi;
    }
#endif
}

/**
 * Substract timestamp t2 from t1.
 * @param t1	    t1.
 * @param t2	    t2.
 */
PJ_INLINE(void) pj_sub_timestamp32(pj_timestamp *t1, pj_uint32_t t2)
{
#if PJ_HAS_INT64
    t1->u64 -= t2;
#else
    if (t1->u32.lo >= t2)
	t1->u32.lo -= t2;
    else {
	t1->u32.lo -= t2;
	--t1->u32.hi;
    }
#endif
}

/**
 * Get the timestamp difference between t2 and t1 (that is t2 minus t1),
 * and return a 32bit signed integer difference.
 */
PJ_INLINE(pj_int32_t) pj_timestamp_diff32(const pj_timestamp *t1,
					  const pj_timestamp *t2)
{
    /* Be careful with the signess (I think!) */
#if PJ_HAS_INT64
    pj_int64_t diff = t2->u64 - t1->u64;
    return (pj_int32_t) diff;
#else
    pj_int32 diff = t2->u32.lo - t1->u32.lo;
    return diff;
#endif
}


/**
 * Calculate the elapsed time, and store it in pj_time_val.
 * This function calculates the elapsed time using highest precision
 * calculation that is available for current platform, considering
 * whether floating point or 64-bit precision arithmetic is available. 
 * For maximum portability, application should prefer to use this function
 * rather than calculating the elapsed time by itself.
 *
 * @param start     The starting timestamp.
 * @param stop      The end timestamp.
 *
 * @return	    Elapsed time as #pj_time_val.
 *
 * @see pj_elapsed_usec(), pj_elapsed_cycle(), pj_elapsed_nanosec()
 */
PJ_DECL(pj_time_val) pj_elapsed_time( const pj_timestamp *start,
                                      const pj_timestamp *stop );

/**
 * Calculate the elapsed time as 32-bit miliseconds.
 * This function calculates the elapsed time using highest precision
 * calculation that is available for current platform, considering
 * whether floating point or 64-bit precision arithmetic is available. 
 * For maximum portability, application should prefer to use this function
 * rather than calculating the elapsed time by itself.
 *
 * @param start     The starting timestamp.
 * @param stop      The end timestamp.
 *
 * @return	    Elapsed time in milisecond.
 *
 * @see pj_elapsed_time(), pj_elapsed_cycle(), pj_elapsed_nanosec()
 */
PJ_DECL(pj_uint32_t) pj_elapsed_msec( const pj_timestamp *start,
                                      const pj_timestamp *stop );

/**
 * Calculate the elapsed time in 32-bit microseconds.
 * This function calculates the elapsed time using highest precision
 * calculation that is available for current platform, considering
 * whether floating point or 64-bit precision arithmetic is available. 
 * For maximum portability, application should prefer to use this function
 * rather than calculating the elapsed time by itself.
 *
 * @param start     The starting timestamp.
 * @param stop      The end timestamp.
 *
 * @return	    Elapsed time in microsecond.
 *
 * @see pj_elapsed_time(), pj_elapsed_cycle(), pj_elapsed_nanosec()
 */
PJ_DECL(pj_uint32_t) pj_elapsed_usec( const pj_timestamp *start,
                                      const pj_timestamp *stop );

/**
 * Calculate the elapsed time in 32-bit nanoseconds.
 * This function calculates the elapsed time using highest precision
 * calculation that is available for current platform, considering
 * whether floating point or 64-bit precision arithmetic is available. 
 * For maximum portability, application should prefer to use this function
 * rather than calculating the elapsed time by itself.
 *
 * @param start     The starting timestamp.
 * @param stop      The end timestamp.
 *
 * @return	    Elapsed time in nanoseconds.
 *
 * @see pj_elapsed_time(), pj_elapsed_cycle(), pj_elapsed_usec()
 */
PJ_DECL(pj_uint32_t) pj_elapsed_nanosec( const pj_timestamp *start,
                                         const pj_timestamp *stop );

/**
 * Calculate the elapsed time in 32-bit cycles.
 * This function calculates the elapsed time using highest precision
 * calculation that is available for current platform, considering
 * whether floating point or 64-bit precision arithmetic is available. 
 * For maximum portability, application should prefer to use this function
 * rather than calculating the elapsed time by itself.
 *
 * @param start     The starting timestamp.
 * @param stop      The end timestamp.
 *
 * @return	    Elapsed time in cycles.
 *
 * @see pj_elapsed_usec(), pj_elapsed_time(), pj_elapsed_nanosec()
 */
PJ_DECL(pj_uint32_t) pj_elapsed_cycle( const pj_timestamp *start,
                                       const pj_timestamp *stop );


#endif	/* PJ_HAS_HIGH_RES_TIMER */

/** @} */


/* **************************************************************************/
/**
 * Internal PJLIB function to initialize the threading subsystem.
 * @return          PJ_SUCCESS or the appropriate error code.
 */
pj_status_t pj_thread_init(void);


PJ_END_DECL

#endif  /* __PJ_OS_H__ */