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/*
* librd - Rapid Development C library
*
* Copyright (c) 2012, Magnus Edenhill
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _RDTIME_H_
#define _RDTIME_H_
#ifndef TIMEVAL_TO_TIMESPEC
#define TIMEVAL_TO_TIMESPEC(tv, ts) \
do { \
(ts)->tv_sec = (tv)->tv_sec; \
(ts)->tv_nsec = (tv)->tv_usec * 1000; \
} while (0)
#define TIMESPEC_TO_TIMEVAL(tv, ts) \
do { \
(tv)->tv_sec = (ts)->tv_sec; \
(tv)->tv_usec = (ts)->tv_nsec / 1000; \
} while (0)
#endif
#define TIMESPEC_TO_TS(ts) \
(((rd_ts_t)(ts)->tv_sec * 1000000LLU) + ((ts)->tv_nsec / 1000))
#define TS_TO_TIMESPEC(ts, tsx) \
do { \
(ts)->tv_sec = (tsx) / 1000000; \
(ts)->tv_nsec = ((tsx) % 1000000) * 1000; \
if ((ts)->tv_nsec >= 1000000000LLU) { \
(ts)->tv_sec++; \
(ts)->tv_nsec -= 1000000000LLU; \
} \
} while (0)
#define TIMESPEC_CLEAR(ts) ((ts)->tv_sec = (ts)->tv_nsec = 0LLU)
#define RD_POLL_INFINITE -1
#define RD_POLL_NOWAIT 0
#if RD_UNITTEST_QPC_OVERRIDES
/* Overrides for rd_clock() unittest using QPC on Windows */
BOOL rd_ut_QueryPerformanceFrequency(_Out_ LARGE_INTEGER *lpFrequency);
BOOL rd_ut_QueryPerformanceCounter(_Out_ LARGE_INTEGER *lpPerformanceCount);
#define rd_QueryPerformanceFrequency(IFREQ) \
rd_ut_QueryPerformanceFrequency(IFREQ)
#define rd_QueryPerformanceCounter(PC) rd_ut_QueryPerformanceCounter(PC)
#else
#define rd_QueryPerformanceFrequency(IFREQ) QueryPerformanceFrequency(IFREQ)
#define rd_QueryPerformanceCounter(PC) QueryPerformanceCounter(PC)
#endif
/**
* @returns a monotonically increasing clock in microseconds.
* @remark There is no monotonic clock on OSX, the system time
* is returned instead.
*/
static RD_INLINE rd_ts_t rd_clock(void) RD_UNUSED;
static RD_INLINE rd_ts_t rd_clock(void) {
#if defined(__APPLE__) || (defined(__ANDROID__) && __ANDROID_API__ < 29)
/* No monotonic clock on Darwin */
struct timeval tv;
gettimeofday(&tv, NULL);
return ((rd_ts_t)tv.tv_sec * 1000000LLU) + (rd_ts_t)tv.tv_usec;
#elif defined(_WIN32)
LARGE_INTEGER now;
static RD_TLS double freq = 0.0;
if (!freq) {
LARGE_INTEGER ifreq;
rd_QueryPerformanceFrequency(&ifreq);
/* Convert frequency to double to avoid overflow in
* return statement */
freq = (double)ifreq.QuadPart / 1000000.0;
}
rd_QueryPerformanceCounter(&now);
return (rd_ts_t)((double)now.QuadPart / freq);
#else
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return ((rd_ts_t)ts.tv_sec * 1000000LLU) +
((rd_ts_t)ts.tv_nsec / 1000LLU);
#endif
}
/**
* @returns UTC wallclock time as number of microseconds since
* beginning of the epoch.
*/
static RD_INLINE RD_UNUSED rd_ts_t rd_uclock(void) {
struct timeval tv;
rd_gettimeofday(&tv, NULL);
return ((rd_ts_t)tv.tv_sec * 1000000LLU) + (rd_ts_t)tv.tv_usec;
}
/**
* Thread-safe version of ctime() that strips the trailing newline.
*/
static RD_INLINE const char *rd_ctime(const time_t *t) RD_UNUSED;
static RD_INLINE const char *rd_ctime(const time_t *t) {
static RD_TLS char ret[27];
#ifndef _WIN32
ctime_r(t, ret);
#else
ctime_s(ret, sizeof(ret), t);
#endif
ret[25] = '\0';
return ret;
}
/**
* @brief Convert a relative millisecond timeout to microseconds,
* properly handling RD_POLL_NOWAIT, et.al.
*/
static RD_INLINE rd_ts_t rd_timeout_us(int timeout_ms) {
if (timeout_ms <= 0)
return (rd_ts_t)timeout_ms;
else
return (rd_ts_t)timeout_ms * 1000;
}
/**
* @brief Convert a relative microsecond timeout to milliseconds,
* properly handling RD_POLL_NOWAIT, et.al.
*/
static RD_INLINE int rd_timeout_ms(rd_ts_t timeout_us) {
if (timeout_us <= 0)
return (int)timeout_us;
else
/* + 999: Round up to millisecond to
* avoid busy-looping during the last
* millisecond. */
return (int)((timeout_us + 999) / 1000);
}
/**
* @brief Initialize an absolute timeout based on the provided \p timeout_ms
*
* To be used with rd_timeout_adjust().
*
* Honours RD_POLL_INFINITE, RD_POLL_NOWAIT.
*
* @returns the absolute timeout which should later be passed
* to rd_timeout_adjust().
*/
static RD_INLINE rd_ts_t rd_timeout_init(int timeout_ms) {
if (timeout_ms == RD_POLL_INFINITE || timeout_ms == RD_POLL_NOWAIT)
return timeout_ms;
return rd_clock() + ((rd_ts_t)timeout_ms * 1000);
}
/**
* @brief Initialize an absolute timespec timeout based on the provided
* relative \p timeout_us.
*
* To be used with cnd_timedwait_abs().
*
* Honours RD_POLL_INFITE and RD_POLL_NOWAIT (reflected in tspec.tv_sec).
*/
static RD_INLINE void rd_timeout_init_timespec_us(struct timespec *tspec,
rd_ts_t timeout_us) {
if (timeout_us == RD_POLL_INFINITE || timeout_us == RD_POLL_NOWAIT) {
tspec->tv_sec = timeout_us;
tspec->tv_nsec = 0;
} else {
#if defined(__APPLE__) || (defined(__ANDROID__) && __ANDROID_API__ < 29)
struct timeval tv;
gettimeofday(&tv, NULL);
TIMEVAL_TO_TIMESPEC(&tv, tspec);
#else
timespec_get(tspec, TIME_UTC);
#endif
tspec->tv_sec += timeout_us / 1000000;
tspec->tv_nsec += (timeout_us % 1000000) * 1000;
if (tspec->tv_nsec >= 1000000000) {
tspec->tv_nsec -= 1000000000;
tspec->tv_sec++;
}
}
}
/**
* @brief Initialize an absolute timespec timeout based on the provided
* relative \p timeout_ms.
*
* To be used with cnd_timedwait_abs().
*
* Honours RD_POLL_INFITE and RD_POLL_NOWAIT (reflected in tspec.tv_sec).
*/
static RD_INLINE void rd_timeout_init_timespec(struct timespec *tspec,
int timeout_ms) {
if (timeout_ms == RD_POLL_INFINITE || timeout_ms == RD_POLL_NOWAIT) {
tspec->tv_sec = timeout_ms;
tspec->tv_nsec = 0;
} else {
#if defined(__APPLE__) || (defined(__ANDROID__) && __ANDROID_API__ < 29)
struct timeval tv;
gettimeofday(&tv, NULL);
TIMEVAL_TO_TIMESPEC(&tv, tspec);
#else
timespec_get(tspec, TIME_UTC);
#endif
tspec->tv_sec += timeout_ms / 1000;
tspec->tv_nsec += (timeout_ms % 1000) * 1000000;
if (tspec->tv_nsec >= 1000000000) {
tspec->tv_nsec -= 1000000000;
tspec->tv_sec++;
}
}
}
/**
* @brief Same as rd_timeout_remains() but with microsecond precision
*/
static RD_INLINE rd_ts_t rd_timeout_remains_us(rd_ts_t abs_timeout) {
rd_ts_t timeout_us;
if (abs_timeout == RD_POLL_INFINITE || abs_timeout == RD_POLL_NOWAIT)
return (rd_ts_t)abs_timeout;
timeout_us = abs_timeout - rd_clock();
if (timeout_us <= 0)
return RD_POLL_NOWAIT;
else
return timeout_us;
}
/**
* @returns the remaining timeout for timeout \p abs_timeout previously set
* up by rd_timeout_init()
*
* Honours RD_POLL_INFINITE, RD_POLL_NOWAIT.
*
* @remark Check explicitly for 0 (NOWAIT) to check if there is
* no remaining time to wait. Any other value, even negative (INFINITE),
* means there is remaining time.
* rd_timeout_expired() can be used to check the return value
* in a bool fashion.
*/
static RD_INLINE int rd_timeout_remains(rd_ts_t abs_timeout) {
return rd_timeout_ms(rd_timeout_remains_us(abs_timeout));
}
/**
* @brief Like rd_timeout_remains() but limits the maximum time to \p limit_ms,
* and operates on the return value of rd_timeout_remains().
*/
static RD_INLINE int rd_timeout_remains_limit0(int remains_ms, int limit_ms) {
if (remains_ms == RD_POLL_INFINITE || remains_ms > limit_ms)
return limit_ms;
else
return remains_ms;
}
/**
* @brief Like rd_timeout_remains() but limits the maximum time to \p limit_ms
*/
static RD_INLINE int rd_timeout_remains_limit(rd_ts_t abs_timeout,
int limit_ms) {
return rd_timeout_remains_limit0(rd_timeout_remains(abs_timeout),
limit_ms);
}
/**
* @returns 1 if the **relative** timeout as returned by rd_timeout_remains()
* has timed out / expired, else 0.
*/
static RD_INLINE int rd_timeout_expired(int timeout_ms) {
return timeout_ms == RD_POLL_NOWAIT;
}
#endif /* _RDTIME_H_ */
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