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Fix nanosleep usage

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nanosleep returns 0 or -1 not the error code.
The error code "EINTR" (if encountered) is placed in errno, in which case nanosleep can be safely recalled with the remaining time.

This is required, so that nanosleep continues if the calling thread is interrupted by a signal.

See manpage nanosleep(2) for additional details.
This commit is contained in:
Lorenz Junglas 2020-10-12 16:27:31 +02:00
parent ab0907c1ba
commit 1107c7f327
1 changed files with 5 additions and 2 deletions
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7
drivers/unix/os_unix.cpp
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@ -235,8 +235,11 @@ OS::TimeZoneInfo OS_Unix::get_time_zone_info() const {
}
void OS_Unix::delay_usec(uint32_t p_usec) const {
struct timespec rem = { static_cast<time_t>(p_usec / 1000000), (static_cast<long>(p_usec) % 1000000) * 1000 };
while (nanosleep(&rem, &rem) == EINTR) {
struct timespec requested = { static_cast<time_t>(p_usec / 1000000), (static_cast<long>(p_usec) % 1000000) * 1000 };
struct timespec remaining;
while (nanosleep(&requested, &remaining) == -1 && errno == EINTR) {
requested.tv_sec = remaining.tv_sec;
requested.tv_nsec = remaining.tv_nsec;
}
}