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6546236: Thread interrupt() of Thread.sleep() can be lost on Solaris due to race with signal handler

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Reviewed-by: dholmes, dcubed
This commit is contained in:
Frederic Parain 2014-02-19 16:22:15 +00:00
parent a9868648e6
commit eff08434da
13 changed files with 180 additions and 467 deletions
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133
hotspot/src/os/linux/vm/os_linux.cpp
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@ -1451,7 +1451,7 @@ void os::Linux::fast_thread_clock_init() {
}
jlong os::javaTimeNanos() {
if (Linux::supports_monotonic_clock()) {
if (os::supports_monotonic_clock()) {
struct timespec tp;
int status = Linux::clock_gettime(CLOCK_MONOTONIC, &tp);
assert(status == 0, "gettime error");
@ -1467,7 +1467,7 @@ jlong os::javaTimeNanos() {
}
void os::javaTimeNanos_info(jvmtiTimerInfo *info_ptr) {
if (Linux::supports_monotonic_clock()) {
if (os::supports_monotonic_clock()) {
info_ptr->max_value = ALL_64_BITS;
// CLOCK_MONOTONIC - amount of time since some arbitrary point in the past
@ -3795,85 +3795,6 @@ size_t os::read(int fd, void *buf, unsigned int nBytes) {
return ::read(fd, buf, nBytes);
}
// TODO-FIXME: reconcile Solaris' os::sleep with the linux variation.
// Solaris uses poll(), linux uses park().
// Poll() is likely a better choice, assuming that Thread.interrupt()
// generates a SIGUSRx signal. Note that SIGUSR1 can interfere with
// SIGSEGV, see 4355769.
int os::sleep(Thread* thread, jlong millis, bool interruptible) {
assert(thread == Thread::current(), "thread consistency check");
ParkEvent * const slp = thread->_SleepEvent ;
slp->reset() ;
OrderAccess::fence() ;
if (interruptible) {
jlong prevtime = javaTimeNanos();
for (;;) {
if (os::is_interrupted(thread, true)) {
return OS_INTRPT;
}
jlong newtime = javaTimeNanos();
if (newtime - prevtime < 0) {
// time moving backwards, should only happen if no monotonic clock
// not a guarantee() because JVM should not abort on kernel/glibc bugs
assert(!Linux::supports_monotonic_clock(), "time moving backwards");
} else {
millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
}
if(millis <= 0) {
return OS_OK;
}
prevtime = newtime;
{
assert(thread->is_Java_thread(), "sanity check");
JavaThread *jt = (JavaThread *) thread;
ThreadBlockInVM tbivm(jt);
OSThreadWaitState osts(jt->osthread(), false /* not Object.wait() */);
jt->set_suspend_equivalent();
// cleared by handle_special_suspend_equivalent_condition() or
// java_suspend_self() via check_and_wait_while_suspended()
slp->park(millis);
// were we externally suspended while we were waiting?
jt->check_and_wait_while_suspended();
}
}
} else {
OSThreadWaitState osts(thread->osthread(), false /* not Object.wait() */);
jlong prevtime = javaTimeNanos();
for (;;) {
// It'd be nice to avoid the back-to-back javaTimeNanos() calls on
// the 1st iteration ...
jlong newtime = javaTimeNanos();
if (newtime - prevtime < 0) {
// time moving backwards, should only happen if no monotonic clock
// not a guarantee() because JVM should not abort on kernel/glibc bugs
assert(!Linux::supports_monotonic_clock(), "time moving backwards");
} else {
millis -= (newtime - prevtime) / NANOSECS_PER_MILLISEC;
}
if(millis <= 0) break ;
prevtime = newtime;
slp->park(millis);
}
return OS_OK ;
}
}
//
// Short sleep, direct OS call.
//
@ -4226,50 +4147,6 @@ static void do_resume(OSThread* osthread) {
guarantee(osthread->sr.is_running(), "Must be running!");
}
////////////////////////////////////////////////////////////////////////////////
// interrupt support
void os::interrupt(Thread* thread) {
assert(Thread::current() == thread || Threads_lock->owned_by_self(),
"possibility of dangling Thread pointer");
OSThread* osthread = thread->osthread();
if (!osthread->interrupted()) {
osthread->set_interrupted(true);
// More than one thread can get here with the same value of osthread,
// resulting in multiple notifications. We do, however, want the store
// to interrupted() to be visible to other threads before we execute unpark().
OrderAccess::fence();
ParkEvent * const slp = thread->_SleepEvent ;
if (slp != NULL) slp->unpark() ;
}
// For JSR166. Unpark even if interrupt status already was set
if (thread->is_Java_thread())
((JavaThread*)thread)->parker()->unpark();
ParkEvent * ev = thread->_ParkEvent ;
if (ev != NULL) ev->unpark() ;
}
bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
assert(Thread::current() == thread || Threads_lock->owned_by_self(),
"possibility of dangling Thread pointer");
OSThread* osthread = thread->osthread();
bool interrupted = osthread->interrupted();
if (interrupted && clear_interrupted) {
osthread->set_interrupted(false);
// consider thread->_SleepEvent->reset() ... optional optimization
}
return interrupted;
}
///////////////////////////////////////////////////////////////////////////////////
// signal handling (except suspend/resume)
@ -4787,7 +4664,7 @@ void os::init(void) {
fatal(err_msg("pthread_condattr_init: %s", strerror(status)));
}
// Only set the clock if CLOCK_MONOTONIC is available
if (Linux::supports_monotonic_clock()) {
if (os::supports_monotonic_clock()) {
if ((status = pthread_condattr_setclock(_condattr, CLOCK_MONOTONIC)) != 0) {
if (status == EINVAL) {
warning("Unable to use monotonic clock with relative timed-waits" \
@ -5618,7 +5495,7 @@ static struct timespec* compute_abstime(timespec* abstime, jlong millis) {
seconds = 50000000;
}
if (os::Linux::supports_monotonic_clock()) {
if (os::supports_monotonic_clock()) {
struct timespec now;
int status = os::Linux::clock_gettime(CLOCK_MONOTONIC, &now);
assert_status(status == 0, status, "clock_gettime");
@ -5835,7 +5712,7 @@ static void unpackTime(timespec* absTime, bool isAbsolute, jlong time) {
assert (time > 0, "convertTime");
time_t max_secs = 0;
if (!os::Linux::supports_monotonic_clock() || isAbsolute) {
if (!os::supports_monotonic_clock() || isAbsolute) {
struct timeval now;
int status = gettimeofday(&now, NULL);
assert(status == 0, "gettimeofday");