github.com/SagerNet/gvisor@v0.0.0-20210707092255-7731c139d75c/tools/checklocks/test/defer.go (about)

     1  // Copyright 2020 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package test
    16  
    17  func testDeferValidUnlock(tc *oneGuardStruct) {
    18  	tc.mu.Lock()
    19  	tc.guardedField = 1
    20  	defer tc.mu.Unlock()
    21  }
    22  
    23  func testDeferValidAccess(tc *oneGuardStruct) {
    24  	tc.mu.Lock()
    25  	defer func() {
    26  		tc.guardedField = 1
    27  		tc.mu.Unlock()
    28  	}()
    29  }
    30  
    31  func testDeferInvalidAccess(tc *oneGuardStruct) {
    32  	tc.mu.Lock()
    33  	defer func() {
    34  		// N.B. Executed after tc.mu.Unlock().
    35  		tc.guardedField = 1 // +checklocksfail
    36  	}()
    37  	tc.mu.Unlock()
    38  }