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Bug 892201: replace SPS signal handler completion busy loop with POSIX semaphore. r=benwa

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--HG--
extra : rebase_source : 48bfcc1a352ae600dd1294d5b5e122ad0c58a745
This commit is contained in:
Jed Davis 2013-07-11 23:41:19 -04:00
parent 5a1c4394b2
commit 54bfab9cb0
1 changed files with 13 additions and 3 deletions
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16
tools/profiler/platform-linux.cc
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@ -53,6 +53,7 @@
#include <sys/stat.h> // open
#include <fcntl.h> // open
#include <unistd.h> // sysconf
#include <semaphore.h>
#ifdef __GLIBC__
#include <execinfo.h> // backtrace, backtrace_symbols
#endif // def __GLIBC__
@ -62,6 +63,7 @@
#include "platform.h"
#include "GeckoProfilerImpl.h"
#include "mozilla/Mutex.h"
#include "mozilla/Atomics.h"
#include "ProfileEntry.h"
#include "nsThreadUtils.h"
#include "TableTicker.h"
@ -140,7 +142,8 @@ struct SamplerRegistry {
Sampler *SamplerRegistry::sampler = NULL;
static ThreadProfile* sCurrentThreadProfile = NULL;
static mozilla::Atomic<ThreadProfile*> sCurrentThreadProfile;
static sem_t sSignalHandlingDone;
static void ProfilerSaveSignalHandler(int signal, siginfo_t* info, void* context) {
Sampler::GetActiveSampler()->RequestSave();
@ -204,6 +207,7 @@ static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) {
Sampler::GetActiveSampler()->Tick(sample);
sCurrentThreadProfile = NULL;
sem_post(&sSignalHandlingDone);
}
int tgkill(pid_t tgid, pid_t tid, int signalno) {
@ -270,8 +274,7 @@ static void* SignalSender(void* arg) {
}
// Wait for the signal handler to run before moving on to the next one
while (sCurrentThreadProfile)
sched_yield();
sem_wait(&sSignalHandlingDone);
}
}
@ -304,6 +307,13 @@ void Sampler::Start() {
SamplerRegistry::AddActiveSampler(this);
// Initialize signal handler communication
sCurrentThreadProfile = NULL;
if (sem_init(&sSignalHandlingDone, /* pshared: */ 0, /* value: */ 0) != 0) {
LOG("Error initializing semaphore");
return;
}
// Request profiling signals.
LOG("Request signal");
struct sigaction sa;