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GeezerVison is showing github.com — stackimpact-java/src/cpu_profiler.cpp at master · stackimpact/stackimpact-java

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cpu_profiler.cpp

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#include <signal.h>
#include <sys/time.h>
#include <string>
#include <sstream>
#include <iostream>
#include "cpu_profiler.h"
using namespace std;
void SignalHandler(int signum, siginfo_t *info, void *context) {
if (info->si_code <= 0) {
return;
}
Agent::instance.cpu_profiler->HandleSignal(context);
}
bool CPUProfiler::SetupProfiler() {
if (!profile_recorder->sample_index.is_lock_free()) {
Agent::instance.LogInfo("Lock-free atomics not available.");
return false;
}
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_handler = NULL;
sa.sa_sigaction = SignalHandler;
sa.sa_flags = SA_RESTART | SA_SIGINFO;
if (sigaction(SIGPROF, &sa, NULL) < 0) {
Agent::instance.LogInfo("Signal handler setup failed.");
return false;
}
return true;
}
void CPUProfiler::DestroyProfiler() {
SetSamplingRate(0);
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_handler = SIG_DFL;
sigaction(SIGPROF, &sa, NULL);
}
void CPUProfiler::StartProfiler() {
profile_recorder->Reset();
SetSamplingRate(sampling_rate);
}
void CPUProfiler::StopProfiler() {
SetSamplingRate(0);
}
void CPUProfiler::SetSamplingRate(long rate) {
static struct itimerval timer;
timer.it_interval.tv_sec = 0;
timer.it_interval.tv_usec = rate;
timer.it_value = timer.it_interval;
if (setitimer(ITIMER_PROF, &timer, 0) == -1) {
ostringstream msg;
msg << "setitimer failed with error " << errno;
Agent::instance.LogError(msg.str());
return;
}
}
void CPUProfiler::HandleSignal(void* context) {
profile_recorder->RecordSample(0, context);
}
extern "C" JNIEXPORT jboolean JNICALL Java_com_stackimpact_agent_profilers_CPUProfiler_setupCPUProfiler(JNIEnv* env, jobject unused, jlong sampling_rate) {
Agent* agent = &Agent::instance;
agent->cpu_profiler->sampling_rate = (long)sampling_rate;
return agent->cpu_profiler->SetupProfiler();
}
extern "C" JNIEXPORT void JNICALL Java_com_stackimpact_agent_profilers_CPUProfiler_destroyCPUProfiler(JNIEnv* env, jobject unused) {
Agent* agent = &Agent::instance;
agent->cpu_profiler->DestroyProfiler();
}
extern "C" JNIEXPORT void JNICALL Java_com_stackimpact_agent_profilers_CPUProfiler_startCPUProfiler(JNIEnv* env, jobject unused) {
Agent* agent = &Agent::instance;
agent->cpu_profiler->StartProfiler();
}
extern "C" JNIEXPORT jobjectArray JNICALL Java_com_stackimpact_agent_profilers_CPUProfiler_stopCPUProfiler(JNIEnv* env, jobject unused) {
Agent* agent = &Agent::instance;
agent->cpu_profiler->StopProfiler();
return agent->cpu_profiler->profile_recorder->ExportProfile(env);
}
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