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8037340: Linux semaphores to use CLOCK_REALTIME

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Reviewed-by: dholmes, sla
This commit is contained in:
Markus Grönlund 2014-03-20 14:28:25 +01:00
parent 4880019b3e
commit 15e6b91ca5
1 changed files with 17 additions and 3 deletions
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20
hotspot/src/os/linux/vm/os_linux.cpp
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@ -109,6 +109,8 @@
#define MAX_PATH (2 * K)
#define MAX_SECS 100000000
// for timer info max values which include all bits
#define ALL_64_BITS CONST64(0xFFFFFFFFFFFFFFFF)
@ -2434,7 +2436,6 @@ class Semaphore : public StackObj {
sem_t _semaphore;
};
Semaphore::Semaphore() {
sem_init(&_semaphore, 0, 0);
}
@ -2456,8 +2457,22 @@ bool Semaphore::trywait() {
}
bool Semaphore::timedwait(unsigned int sec, int nsec) {
struct timespec ts;
unpackTime(&ts, false, (sec * NANOSECS_PER_SEC) + nsec);
// Semaphore's are always associated with CLOCK_REALTIME
os::Linux::clock_gettime(CLOCK_REALTIME, &ts);
// see unpackTime for discussion on overflow checking
if (sec >= MAX_SECS) {
ts.tv_sec += MAX_SECS;
ts.tv_nsec = 0;
} else {
ts.tv_sec += sec;
ts.tv_nsec += nsec;
if (ts.tv_nsec >= NANOSECS_PER_SEC) {
ts.tv_nsec -= NANOSECS_PER_SEC;
++ts.tv_sec; // note: this must be <= max_secs
}
}
while (1) {
int result = sem_timedwait(&_semaphore, &ts);
@ -5661,7 +5676,6 @@ void os::PlatformEvent::unpark() {
* is no need to track notifications.
*/
#define MAX_SECS 100000000
/*
* This code is common to linux and solaris and will be moved to a
* common place in dolphin.