github.com/aloncn/graphics-go@v0.0.1/src/runtime/cgo/gcc_util.c (about)

     1  // Copyright 2009 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  // +build cgo
     6  
     7  #include "libcgo.h"
     8  
     9  /* Stub for calling malloc from Go */
    10  void
    11  x_cgo_malloc(void *p)
    12  {
    13  	struct a {
    14  		long long n;
    15  		void *ret;
    16  	} *a = p;
    17  
    18  	a->ret = malloc(a->n);
    19  	if(a->ret == NULL && a->n == 0)
    20  		a->ret = malloc(1);
    21  }
    22  
    23  /* Stub for calling free from Go */
    24  void
    25  x_cgo_free(void *p)
    26  {
    27  	struct a {
    28  		void *arg;
    29  	} *a = p;
    30  
    31  	free(a->arg);
    32  }
    33  
    34  /* Stub for creating a new thread */
    35  void
    36  x_cgo_thread_start(ThreadStart *arg)
    37  {
    38  	ThreadStart *ts;
    39  
    40  	/* Make our own copy that can persist after we return. */
    41  	ts = malloc(sizeof *ts);
    42  	if(ts == nil) {
    43  		fprintf(stderr, "runtime/cgo: out of memory in thread_start\n");
    44  		abort();
    45  	}
    46  	*ts = *arg;
    47  
    48  	_cgo_sys_thread_start(ts);	/* OS-dependent half */
    49  }