936615752a
Copy all the misc/cgo files from the gc toolchain into libgo/misc.
These will be used for testing purposes by later changes to the
gotools directory.
Reviewed-on: https://go-review.googlesource.com/46721
From-SVN: r249674
68 lines
1.3 KiB
Go
68 lines
1.3 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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// This program failed when run under the C/C++ ThreadSanitizer. The
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// TSAN library was not keeping track of whether signals should be
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// delivered on the alternate signal stack, and the Go signal handler
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// was not preserving callee-saved registers from C callers.
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/*
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#cgo CFLAGS: -g -fsanitize=thread
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#cgo LDFLAGS: -g -fsanitize=thread
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#include <stdlib.h>
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#include <sys/time.h>
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void spin() {
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size_t n;
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struct timeval tvstart, tvnow;
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int diff;
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void *prev = NULL, *cur;
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gettimeofday(&tvstart, NULL);
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for (n = 0; n < 1<<20; n++) {
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cur = malloc(n);
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free(prev);
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prev = cur;
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gettimeofday(&tvnow, NULL);
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diff = (tvnow.tv_sec - tvstart.tv_sec) * 1000 * 1000 + (tvnow.tv_usec - tvstart.tv_usec);
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// Profile frequency is 100Hz so we should definitely
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// get a signal in 50 milliseconds.
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if (diff > 50 * 1000) {
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break;
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}
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}
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free(prev);
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}
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*/
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import "C"
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import (
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"io/ioutil"
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"runtime/pprof"
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"time"
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)
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func goSpin() {
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start := time.Now()
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for n := 0; n < 1<<20; n++ {
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_ = make([]byte, n)
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if time.Since(start) > 50*time.Millisecond {
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break
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}
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}
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}
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func main() {
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pprof.StartCPUProfile(ioutil.Discard)
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go C.spin()
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goSpin()
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pprof.StopCPUProfile()
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}
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