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git://sigrok.org/libserialport
synced 2023-08-10 21:13:24 +03:00
Abstract all time handling operations.
This commit is contained in:
Martin Ling
parent
d9cc984fe7
commit
9a7945af84
@ -39,6 +39,7 @@
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#include <errno.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#ifdef _WIN32
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#include <windows.h>
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#include <tchar.h>
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136
serialport.c
136
serialport.c
@ -56,25 +56,69 @@ static enum sp_return set_config(struct sp_port *port, struct port_data *data,
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const struct sp_port_config *config);
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#ifndef _WIN32
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static void get_time(struct timeval *time)
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/* Timing abstraction */
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struct time {
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struct timeval tv;
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};
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#define TIME_ZERO {.tv = {0, 0}}
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#define TIME_MS(ms) {.tv = {ms / 1000, (ms % 1000) * 1000}}
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static void time_get(struct time *time)
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{
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#ifdef HAVE_CLOCK_GETTIME
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1)
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clock_gettime(CLOCK_REALTIME, &ts);
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time->tv_sec = ts.tv_sec;
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time->tv_usec = ts.tv_nsec / 1000;
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time->tv.tv_sec = ts.tv_sec;
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time->tv.tv_usec = ts.tv_nsec / 1000;
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#elif defined(__APPLE__)
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mach_timebase_info_data_t info;
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mach_timebase_info(&info);
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uint64_t ticks = mach_absolute_time();
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uint64_t ns = (ticks * info.numer) / info.denom;
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time->tv_sec = ns / 1000000000;
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time->tv_usec = (ns % 1000000000) / 1000;
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time->tv.tv_sec = ns / 1000000000;
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time->tv.tv_usec = (ns % 1000000000) / 1000;
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#else
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gettimeofday(time, NULL);
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gettimeofday(&time->tv, NULL);
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#endif
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}
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static void time_set_ms(struct time *time, unsigned int ms)
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{
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time->tv.tv_sec = ms / 1000;
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time->tv.tv_usec = (ms % 1000) * 1000;
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}
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static void time_add(const struct time *a,
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const struct time *b, struct time *result)
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{
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timeradd(&a->tv, &b->tv, &result->tv);
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}
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static void time_sub(const struct time *a,
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const struct time *b, struct time *result)
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{
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timersub(&a->tv, &b->tv, &result->tv);
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}
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static bool time_greater(const struct time *a, const struct time *b)
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{
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return timercmp(&a->tv, &b->tv, >);
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}
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static void time_as_timeval(const struct time *time, struct timeval *tv)
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{
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*tv = time->tv;
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}
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static unsigned int time_as_ms(const struct time *time)
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{
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return time->tv.tv_sec * 1000 + time->tv.tv_usec / 1000;
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}
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#endif
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SP_API enum sp_return sp_get_port_by_name(const char *portname, struct sp_port **port_ptr)
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@ -843,19 +887,18 @@ SP_API enum sp_return sp_blocking_write(struct sp_port *port, const void *buf,
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#else
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size_t bytes_written = 0;
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unsigned char *ptr = (unsigned char *) buf;
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struct timeval start, delta, now, end = {0, 0};
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struct time start, delta, now, end = TIME_ZERO;
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int started = 0;
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fd_set fds;
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int result;
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if (timeout_ms) {
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/* Get time at start of operation. */
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get_time(&start);
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time_get(&start);
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/* Define duration of timeout. */
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delta.tv_sec = timeout_ms / 1000;
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delta.tv_usec = (timeout_ms % 1000) * 1000;
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time_set_ms(&delta, timeout_ms);
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/* Calculate time at which we should give up. */
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timeradd(&start, &delta, &end);
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time_add(&start, &delta, &end);
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}
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FD_ZERO(&fds);
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@ -868,14 +911,16 @@ SP_API enum sp_return sp_blocking_write(struct sp_port *port, const void *buf,
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* to avoid any issues if a short timeout is reached before
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* select() is even run.
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*/
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struct timeval tv;
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if (timeout_ms && started) {
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get_time(&now);
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if (timercmp(&now, &end, >))
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time_get(&now);
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if (time_greater(&now, &end))
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/* Timeout has expired. */
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break;
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timersub(&end, &now, &delta);
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time_sub(&end, &now, &delta);
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time_as_timeval(&delta, &tv);
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}
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result = select(port->fd + 1, NULL, &fds, NULL, timeout_ms ? &delta : NULL);
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result = select(port->fd + 1, NULL, &fds, NULL, timeout_ms ? &tv : NULL);
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started = 1;
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if (result < 0) {
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if (errno == EINTR) {
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@ -1063,19 +1108,18 @@ SP_API enum sp_return sp_blocking_read(struct sp_port *port, void *buf,
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#else
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size_t bytes_read = 0;
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unsigned char *ptr = (unsigned char *) buf;
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struct timeval start, delta, now, end = {0, 0};
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struct time start, delta, now, end = TIME_ZERO;
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int started = 0;
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fd_set fds;
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int result;
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if (timeout_ms) {
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/* Get time at start of operation. */
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get_time(&start);
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time_get(&start);
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/* Define duration of timeout. */
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delta.tv_sec = timeout_ms / 1000;
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delta.tv_usec = (timeout_ms % 1000) * 1000;
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time_set_ms(&delta, timeout_ms);
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/* Calculate time at which we should give up. */
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timeradd(&start, &delta, &end);
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time_add(&start, &delta, &end);
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}
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FD_ZERO(&fds);
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@ -1088,14 +1132,16 @@ SP_API enum sp_return sp_blocking_read(struct sp_port *port, void *buf,
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* to avoid any issues if a short timeout is reached before
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* select() is even run.
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*/
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struct timeval tv;
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if (timeout_ms && started) {
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get_time(&now);
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if (timercmp(&now, &end, >))
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time_get(&now);
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if (time_greater(&now, &end))
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/* Timeout has expired. */
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break;
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timersub(&end, &now, &delta);
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time_sub(&end, &now, &delta);
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time_as_timeval(&delta, &tv);
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}
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result = select(port->fd + 1, &fds, NULL, NULL, timeout_ms ? &delta : NULL);
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result = select(port->fd + 1, &fds, NULL, NULL, timeout_ms ? &tv : NULL);
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started = 1;
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if (result < 0) {
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if (errno == EINTR) {
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@ -1200,19 +1246,18 @@ SP_API enum sp_return sp_blocking_read_next(struct sp_port *port, void *buf,
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#else
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size_t bytes_read = 0;
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struct timeval start, delta, now, end = {0, 0};
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struct time start, delta, now, end = TIME_ZERO;
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int started = 0;
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fd_set fds;
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int result;
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if (timeout_ms) {
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/* Get time at start of operation. */
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get_time(&start);
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time_get(&start);
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/* Define duration of timeout. */
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delta.tv_sec = timeout_ms / 1000;
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delta.tv_usec = (timeout_ms % 1000) * 1000;
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time_set_ms(&delta, timeout_ms);
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/* Calculate time at which we should give up. */
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timeradd(&start, &delta, &end);
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time_add(&start, &delta, &end);
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}
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FD_ZERO(&fds);
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@ -1225,14 +1270,16 @@ SP_API enum sp_return sp_blocking_read_next(struct sp_port *port, void *buf,
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* to avoid any issues if a short timeout is reached before
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* select() is even run.
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*/
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struct timeval tv;
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if (timeout_ms && started) {
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get_time(&now);
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if (timercmp(&now, &end, >))
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time_get(&now);
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if (time_greater(&now, &end))
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/* Timeout has expired. */
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break;
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timersub(&end, &now, &delta);
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time_sub(&end, &now, &delta);
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time_as_timeval(&delta, &tv);
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}
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result = select(port->fd + 1, &fds, NULL, NULL, timeout_ms ? &delta : NULL);
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result = select(port->fd + 1, &fds, NULL, NULL, timeout_ms ? &tv : NULL);
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started = 1;
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if (result < 0) {
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if (errno == EINTR) {
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@ -1483,10 +1530,8 @@ SP_API enum sp_return sp_wait(struct sp_event_set *event_set,
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RETURN_OK();
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#else
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struct timeval start, delta, now, end = {0, 0};
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const struct timeval max_delta = {
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(INT_MAX / 1000), (INT_MAX % 1000) * 1000
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};
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struct time start, delta, now, end = TIME_ZERO;
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const struct time max_delta = TIME_MS(INT_MAX);
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int started = 0, timeout_overflow = 0;
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int result, timeout_remaining_ms;
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struct pollfd *pollfds;
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@ -1509,12 +1554,11 @@ SP_API enum sp_return sp_wait(struct sp_event_set *event_set,
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if (timeout_ms) {
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/* Get time at start of operation. */
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get_time(&start);
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time_get(&start);
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/* Define duration of timeout. */
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delta.tv_sec = timeout_ms / 1000;
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delta.tv_usec = (timeout_ms % 1000) * 1000;
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time_set_ms(&delta, timeout_ms);
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/* Calculate time at which we should give up. */
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timeradd(&start, &delta, &end);
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time_add(&start, &delta, &end);
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}
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/* Loop until an event occurs. */
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@ -1530,15 +1574,15 @@ SP_API enum sp_return sp_wait(struct sp_event_set *event_set,
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timeout_overflow = (timeout_ms > INT_MAX);
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timeout_remaining_ms = timeout_overflow ? INT_MAX : timeout_ms;
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} else {
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get_time(&now);
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if (timercmp(&now, &end, >)) {
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time_get(&now);
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if (time_greater(&now, &end)) {
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DEBUG("Wait timed out");
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break;
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}
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timersub(&end, &now, &delta);
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if ((timeout_overflow = timercmp(&delta, &max_delta, >)))
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time_sub(&end, &now, &delta);
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if ((timeout_overflow = time_greater(&delta, &max_delta)))
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delta = max_delta;
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timeout_remaining_ms = delta.tv_sec * 1000 + delta.tv_usec / 1000;
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timeout_remaining_ms = time_as_ms(&delta);
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}
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result = poll(pollfds, event_set->count, timeout_remaining_ms);
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