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 } 75
