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// 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.
package main
// This program failed when run under the C/C++ ThreadSanitizer. The
// TSAN library was not keeping track of whether signals should be
// delivered on the alternate signal stack, and the Go signal handler
// was not preserving callee-saved registers from C callers.
/*
#cgo CFLAGS: -g -fsanitize=thread
#cgo LDFLAGS: -g -fsanitize=thread
#include <stdlib.h>
#include <sys/time.h>
void spin() {
size_t n;
struct timeval tvstart, tvnow;
int diff;
void *prev = NULL, *cur;
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 a signal in 50 milliseconds.
if (diff > 50 * 1000) {
break;
}
}
free(prev);
}
*/
import "C"
import (
"io"
"runtime/pprof"
"time"
)
func goSpin() {
start := time.Now()
for n := 0; n < 1<<20; n++ {
_ = make([]byte, n)
if time.Since(start) > 50*time.Millisecond {
break
}
}
}
func main() {
pprof.StartCPUProfile(io.Discard)
go C.spin()
goSpin()
pprof.StopCPUProfile()
}