1 // Copyright 2016 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 !plan9,!windows 6 7 // Test that a sequence of callbacks from C to Go get the same m. 8 // This failed to be true on arm and arm64, which was the root cause 9 // of issue 13881. 10 11 package main 12 13 /* 14 #include <stddef.h> 15 #include <pthread.h> 16 17 extern void GoCheckM(); 18 19 static void* thread(void* arg __attribute__ ((unused))) { 20 GoCheckM(); 21 return NULL; 22 } 23 24 static void CheckM() { 25 pthread_t tid; 26 pthread_create(&tid, NULL, thread, NULL); 27 pthread_join(tid, NULL); 28 pthread_create(&tid, NULL, thread, NULL); 29 pthread_join(tid, NULL); 30 } 31 */ 32 import "C" 33 34 import ( 35 "fmt" 36 "os" 37 ) 38 39 func init() { 40 register("EnsureDropM", EnsureDropM) 41 } 42 43 var savedM uintptr 44 45 //export GoCheckM 46 func GoCheckM() { 47 m := runtime_getm_for_test() 48 if savedM == 0 { 49 savedM = m 50 } else if savedM != m { 51 fmt.Printf("m == %x want %x\n", m, savedM) 52 os.Exit(1) 53 } 54 } 55 56 func EnsureDropM() { 57 C.CheckM() 58 fmt.Println("OK") 59 } 60
