Source file src/cmd/cgo/internal/testtls/tls.go

Documentation: cmd/cgo/internal/testtls

     1  // Copyright 2013 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  package cgotlstest
     6  
     7  // extern const char *checkTLS();
     8  // extern void setTLS(int);
     9  // extern int getTLS();
    10  import "C"
    11  
    12  import (
    13  	"runtime"
    14  	"testing"
    15  )
    16  
    17  func testTLS(t *testing.T) {
    18  	if skip := C.checkTLS(); skip != nil {
    19  		t.Skipf("%s", C.GoString(skip))
    20  	}
    21  
    22  	runtime.LockOSThread()
    23  	defer runtime.UnlockOSThread()
    24  
    25  	if val := C.getTLS(); val != 0 {
    26  		t.Fatalf("at start, C.getTLS() = %#x, want 0", val)
    27  	}
    28  
    29  	const keyVal = 0x1234
    30  	C.setTLS(keyVal)
    31  	if val := C.getTLS(); val != keyVal {
    32  		t.Fatalf("at end, C.getTLS() = %#x, want %#x", val, keyVal)
    33  	}
    34  }
    35  

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