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aprof.go
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bigstack_windows.c
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bigstack_windows.go
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callback.go
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catchpanic.go
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cgo.go
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crash.go
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deadlock.go
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dll_windows.go
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dropm.go
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exec.go
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lockosthread.c
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lockosthread.go
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main.go
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numgoroutine.go
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pprof.go
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raceprof.go
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racesig.go
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sigpanic.go
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sigstack.go
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stack_windows.go
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threadpanic.go
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threadpanic_unix.c
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threadpanic_windows.c
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threadpprof.go
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threadprof.go
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traceback.go
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tracebackctxt.go
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tracebackctxt_c.c
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Code Editor : threadpprof.go
// Copyright 2016 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. // +build !plan9,!windows package main // Run a slow C function saving a CPU profile. /* #include <stdint.h> #include <time.h> #include <pthread.h> int threadSalt1; int threadSalt2; void cpuHogThread() { int foo = threadSalt1; int i; for (i = 0; i < 100000; i++) { if (foo > 0) { foo *= foo; } else { foo *= foo + 1; } } threadSalt2 = foo; } void cpuHogThread2() { } static int cpuHogThreadCount; struct cgoTracebackArg { uintptr_t context; uintptr_t sigContext; uintptr_t* buf; uintptr_t max; }; // pprofCgoThreadTraceback is passed to runtime.SetCgoTraceback. // For testing purposes it pretends that all CPU hits in C code are in cpuHog. void pprofCgoThreadTraceback(void* parg) { struct cgoTracebackArg* arg = (struct cgoTracebackArg*)(parg); arg->buf[0] = (uintptr_t)(cpuHogThread) + 0x10; arg->buf[1] = (uintptr_t)(cpuHogThread2) + 0x4; arg->buf[2] = 0; __sync_add_and_fetch(&cpuHogThreadCount, 1); } // getCPUHogThreadCount fetches the number of times we've seen cpuHogThread // in the traceback. int getCPUHogThreadCount() { return __sync_add_and_fetch(&cpuHogThreadCount, 0); } static void* cpuHogDriver(void* arg __attribute__ ((unused))) { while (1) { cpuHogThread(); } return 0; } void runCPUHogThread(void) { pthread_t tid; pthread_create(&tid, 0, cpuHogDriver, 0); } */ import "C" import ( "fmt" "io/ioutil" "os" "runtime" "runtime/pprof" "time" "unsafe" ) func init() { register("CgoPprofThread", CgoPprofThread) register("CgoPprofThreadNoTraceback", CgoPprofThreadNoTraceback) } func CgoPprofThread() { runtime.SetCgoTraceback(0, unsafe.Pointer(C.pprofCgoThreadTraceback), nil, nil) pprofThread() } func CgoPprofThreadNoTraceback() { pprofThread() } func pprofThread() { f, err := ioutil.TempFile("", "prof") if err != nil { fmt.Fprintln(os.Stderr, err) os.Exit(2) } if err := pprof.StartCPUProfile(f); err != nil { fmt.Fprintln(os.Stderr, err) os.Exit(2) } C.runCPUHogThread() t0 := time.Now() for C.getCPUHogThreadCount() < 2 && time.Since(t0) < time.Second { time.Sleep(100 * time.Millisecond) } pprof.StopCPUProfile() name := f.Name() if err := f.Close(); err != nil { fmt.Fprintln(os.Stderr, err) os.Exit(2) } fmt.Println(name) }
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