github.com/FenixAra/go@v0.0.0-20170127160404-96ea0918e670/src/runtime/cgo/gcc_libinit_openbsd.c (about)

     1  // Copyright 2015 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  #include <sys/types.h>
     6  #include <errno.h>
     7  #include <pthread.h>
     8  #include <stdio.h>
     9  #include <stdlib.h>
    10  #include "libcgo.h"
    11  
    12  // The context function, used when tracing back C calls into Go.
    13  static void (*cgo_context_function)(struct context_arg*);
    14  
    15  void
    16  x_cgo_sys_thread_create(void* (*func)(void*), void* arg) {
    17  	fprintf(stderr, "x_cgo_sys_thread_create not implemented");
    18  	abort();
    19  }
    20  
    21  uintptr_t
    22  _cgo_wait_runtime_init_done() {
    23  	void (*pfn)(struct context_arg*);
    24  
    25  	// TODO(spetrovic): implement this method.
    26  
    27  	pfn = _cgo_get_context_function();
    28  	if (pfn != nil) {
    29  		struct context_arg arg;
    30  
    31  		arg.Context = 0;
    32  		(*pfn)(&arg);
    33  		return arg.Context;
    34  	}
    35  	return 0;
    36  }
    37  
    38  void
    39  x_cgo_notify_runtime_init_done(void* dummy) {
    40  	// TODO(spetrovic): implement this method.
    41  }
    42  
    43  // Sets the context function to call to record the traceback context
    44  // when calling a Go function from C code. Called from runtime.SetCgoTraceback.
    45  void x_cgo_set_context_function(void (*context)(struct context_arg*)) {
    46  	// TODO(iant): Needs synchronization.
    47  	cgo_context_function = context;
    48  }
    49  
    50  // Gets the context function.
    51  void (*(_cgo_get_context_function(void)))(struct context_arg*) {
    52  	return cgo_context_function;
    53  }
    54  
    55  // _cgo_try_pthread_create retries sys_pthread_create if it fails with
    56  // EAGAIN.
    57  int
    58  _cgo_openbsd_try_pthread_create(int (*sys_pthread_create)(pthread_t*, const pthread_attr_t*, void* (*)(void*), void*),
    59  	pthread_t* thread, const pthread_attr_t* attr, void* (*pfn)(void*), void* arg) {
    60  	int tries;
    61  	int err;
    62  	struct timespec ts;
    63  
    64  	for (tries = 0; tries < 100; tries++) {
    65  		err = sys_pthread_create(thread, attr, pfn, arg);
    66  		if (err != EAGAIN) {
    67  			return err;
    68  		}
    69  		ts.tv_sec = 0;
    70  		ts.tv_nsec = (tries + 1) * 1000 * 1000; // Milliseconds.
    71  		nanosleep(&ts, nil);
    72  	}
    73  	return EAGAIN;
    74  }