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8087322: Implement a Semaphore utility class

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Reviewed-by: kbarrett, dholmes
This commit is contained in:
Stefan Karlsson 2015-01-19 11:06:08 +01:00
parent 88ff99b454
commit 1a534420a8
12 changed files with 473 additions and 136 deletions
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51
hotspot/src/os/linux/vm/os_linux.cpp
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@ -60,6 +60,7 @@
#include "runtime/thread.inline.hpp"
#include "runtime/threadCritical.hpp"
#include "runtime/timer.hpp"
#include "semaphore_posix.hpp"
#include "services/attachListener.hpp"
#include "services/memTracker.hpp"
#include "services/runtimeService.hpp"
@ -2315,40 +2316,7 @@ void* os::user_handler() {
return CAST_FROM_FN_PTR(void*, UserHandler);
}
class Semaphore : public StackObj {
public:
Semaphore();
~Semaphore();
void signal();
void wait();
bool trywait();
bool timedwait(unsigned int sec, int nsec);
private:
sem_t _semaphore;
};
Semaphore::Semaphore() {
sem_init(&_semaphore, 0, 0);
}
Semaphore::~Semaphore() {
sem_destroy(&_semaphore);
}
void Semaphore::signal() {
sem_post(&_semaphore);
}
void Semaphore::wait() {
sem_wait(&_semaphore);
}
bool Semaphore::trywait() {
return sem_trywait(&_semaphore) == 0;
}
bool Semaphore::timedwait(unsigned int sec, int nsec) {
struct timespec PosixSemaphore::create_timespec(unsigned int sec, int nsec) {
struct timespec ts;
// Semaphore's are always associated with CLOCK_REALTIME
os::Linux::clock_gettime(CLOCK_REALTIME, &ts);
@ -2365,18 +2333,7 @@ bool Semaphore::timedwait(unsigned int sec, int nsec) {
}
}
while (1) {
int result = sem_timedwait(&_semaphore, &ts);
if (result == 0) {
return true;
} else if (errno == EINTR) {
continue;
} else if (errno == ETIMEDOUT) {
return false;
} else {
return false;
}
}
return ts;
}
extern "C" {
@ -2416,7 +2373,7 @@ static volatile jint pending_signals[NSIG+1] = { 0 };
// Linux(POSIX) specific hand shaking semaphore.
static sem_t sig_sem;
static Semaphore sr_semaphore;
static PosixSemaphore sr_semaphore;
void os::signal_init_pd() {
// Initialize signal structures