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// Copyright 2023 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.
package main
// This program failed when run under the C/C++ ThreadSanitizer.
// There was no TSAN synchronization for the call to the cgo
// traceback routine.
/*
#cgo CFLAGS: -g -fsanitize=thread
#cgo LDFLAGS: -g -fsanitize=thread
#include <pthread.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/time.h>
#include <unistd.h>
struct tracebackArg {
uintptr_t Context;
uintptr_t SigContext;
uintptr_t* Buf;
uintptr_t Max;
};
void tsanTraceback(struct tracebackArg *arg) {
arg->Buf[0] = 0;
}
static void* spin(void *arg) {
size_t n;
struct timeval tvstart, tvnow;
int diff;
void *prev;
void *cur;
prev = NULL;
gettimeofday(&tvstart, NULL);
for (n = 0; n < 1<<20; n++) {
cur = malloc(n);
free(prev);
prev = cur;
gettimeofday(&tvnow, NULL);
diff = (tvnow.tv_sec - tvstart.tv_sec) * 1000 * 1000 + (tvnow.tv_usec - tvstart.tv_usec);
// Profile frequency is 100Hz so we should definitely
// get some signals in 50 milliseconds.
if (diff > 50 * 1000) {
break;
}
}
free(prev);
return NULL;
}
static void runThreads(int n) {
pthread_t ids[64];
int i;
if (n > 64) {
n = 64;
}
for (i = 0; i < n; i++) {
pthread_create(&ids[i], NULL, spin, NULL);
}
for (i = 0; i < n; i++) {
pthread_join(ids[i], NULL);
}
}
*/
import "C"
import (
"io"
"runtime"
"runtime/pprof"
"unsafe"
)
func main() {
runtime.SetCgoTraceback(0, unsafe.Pointer(C.tsanTraceback), nil, nil)
pprof.StartCPUProfile(io.Discard)
C.runThreads(C.int(runtime.GOMAXPROCS(0)))
pprof.StopCPUProfile()
}