1  // Copyright 2021 The Go Authors. All rights reserved.
       2  // Use of this source code is governed by a BSD-style
       3  // license that can be found in the LICENSE file.
       4  
       5  //go:build !gccgo
       6  // +build !gccgo
       7  
       8  // The C definitions for gprof.go. That file uses //export so
       9  // it can't put function definitions in the "C" import comment.
      10  
      11  #include <stdint.h>
      12  #include <stdlib.h>
      13  
      14  // Functions exported from Go.
      15  extern void GoSleep();
      16  
      17  struct cgoContextArg {
      18  	uintptr_t context;
      19  };
      20  
      21  void gprofCgoContext(void *arg) {
      22  	((struct cgoContextArg*)arg)->context = 1;
      23  }
      24  
      25  void gprofCgoTraceback(void *arg) {
      26  	// spend some time here so the P is more likely to be retaken.
      27  	volatile int i;
      28  	for (i = 0; i < 123456789; i++);
      29  }
      30  
      31  void CallGoSleep() {
      32  	GoSleep();
      33  }