os_unfair_lock, simple useage from wwdc 2016 concurrency talk by Pierre Habouzit, objective-c, bridging header and Swift 3

gistfile1.txt

#import "FoundationLocks.h"
#import "os/lock.h"

@implementation LockableObject

os_unfair_lock _lock;


- (instancetype) init {
    
    (os_unfair_lock){0};

    return self;
}

- (void) lock {
    
    os_unfair_lock_lock(&_lock);
}

- (void) unlock {
    os_unfair_lock_unlock(&_lock);
}


// and header


#import <Foundation/Foundation.h>

@interface LockableObject : NSObject

- (void) lock;
- (void) unlock;

@end


// and bridging header

//
//  Use this file to import your target's public headers that you would like to expose to Swift.
//


#import "FoundationLocks.h"



// and Swift

let l = LockableObject()
let _ = l.lock()
let _ = l.unlock()

@implementation LockableObject {
    os_unfair_lock _lock;
}

- (instancetype) init
{
    if ((self = [super init])) {
        self->_lock = OS_UNFAIR_LOCK_INIT;
    }
    return self;
}
@end

excellent, thank you!

here's the trylock

• (Boolean) trylock {

  if (os_unfair_lock_trylock(&_lock)) {
  return true;
  }
  return false;
  }