Hi @eskimo and experts,
I created a simple code and found there is a memory leak:
#import <Foundation/Foundation.h>
#include <functional>
void testLeaks(const std::function <void (int)>& inCallback) {
NSTask* task = [[NSTask alloc] init];
[task setTerminationHandler:^(NSTask* inTask) {
inCallback(inTask.terminationStatus);
}];
[task release];
}
int main(int argc, const char * argv[]) {
auto callback = [](int result) {
NSLog(@"callback");
};
testLeaks(callback);
NSLog(@"done");
return 0;
}
The output of leaks:
Process: testLeaks2 [13084]
Path: /Users/USER/Library/Developer/Xcode/DerivedData/Build/Products/Debug/testLeaks2
Load Address: 0x10a04d000
Identifier: testLeaks2
Version: ???
Code Type: X86-64
Platform: macOS
Parent Process: leaks [13083]
Date/Time: 2022-02-28 23:34:28.374 +0800
Launch Time: 2022-02-28 23:34:27.939 +0800
OS Version: Mac OS X 10.15.6 (19G73)
Report Version: 7
Analysis Tool: /Applications/Xcode.app/Contents/Developer/usr/bin/leaks
Analysis Tool Version: Xcode 12.4 (12D4e)
----
leaks Report Version: 4.0
Process 13084: 596 nodes malloced for 59 KB
Process 13084: 1 leak for 48 total leaked bytes.
1 (48 bytes) ROOT LEAK: <__NSMallocBlock__ 0x7fbbc2704350> [48] testLeaks2 invocation function for block in testLeaks(std::__1::function<void (int)> const&) 0..."
Looks the issue is in the block of setTerminationHandler. How do I address this memory leak issue if I want to keep using std::function as a callback?
