C语言程序(存储为一个文件) long gcd(p,q) long p,q; { if(p%q==0) return q; else return gcd(q, p% q) ;}main() { printf( "\n%ld\n",gcdx(4,12))}在x86/Linux系统上用某版本的gcc命令得到的编译结果如下: In function‘main’ : undefined reference to‘gcdx’ ld return...
Thread32name:GCDAsyncSocket-CFStream Thread32Crashed:0libobjc.A.dylib0x19b483c50objc_release+161Foundation0x184161344-[_NSThreadPerformInfo dealloc]+562Foundation0x1842d08dc__NSThreadPerform+1603CoreFoundation0x1829b069cCFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION+284CoreFoundation0x1829c12...
-(void)concurrentQueue{dispatch_queue_t queue=dispatch_queue_create("concurrent queue",DISPATCH_QUEUE_CONCURRENT);for(NSInteger index=0;index<6;index++){dispatch_async(queue,^{NSLog(@"task index %ld in concurrent queue",index);});}} 输出结果: 代码语言:javascript 代码运行次数:0 运行 AI代码解...
voiddispatch_barrier_async_f(dispatch_queue_t dq, void *ctxt, dispatch_function_t func){ dispatch_continuation_t dc; //从线程私有数据中获取一个dispatch_continuation_t的结构体,dispatch_continuation_t中封装了异步执行任务。 dc = fastpath(_dispatch_continuation_alloc_cacheonly()); if (!dc) { ...
(9)一个任务可以是一个函数(function)或者是一个Block,GCD的底层依然是用线程实现的,不过这样可以让程序员不用关注实现的细节. (10) dispatch queue 分为三种 So GCD is the leading role of today. 五.代码示例 1.获取主线程 /** 获取主线程
-> 单例模式是确保某一个类只有一个实例,而且自行实例化并向整个系统提供这个实例。这个类称为单例类 单例模式的作用? -> 可以保证在程序运行过程, 一个类只有一个实例,而且该实例易于供外界访问,从而方便地控制了实例的个数,并节约系统资源 单例模式的使用场合?
The error we receive is - Error Domain=NSPOSIXErrorDomain Code=60 "Operation timed out" UserInfo={NSLocalizedDescription= Operation timed out, NSLocalizedFailureReason=Error in connect() function}Boost Copy pt_test question DTS Engineer Apple Jun ’21 Well, if it’s returning an error and not...
I use a lot standard c++ gcd function (__gcd(x, y)). But today, I learnt that on some compiler __gcd(0, 0) gives exception. (Maybe because 0 is divisible by any number?! ) Note for myself and everybody:While using __gcd we must carefully handle (0, 0) case or write own ...
sock.on('close', function(data) { console.log('CLOSED: ' + sock.remoteAddress + ' ' + sock.remotePort); }); }).listen(PORT, HOST); console.log('Server listening on ' + HOST +':'+ PORT); 看到这不懂node.js的朋友也不用着急,在这里你可以使用任意语言c/c++/java/oc等等去实现后台...
,nk)∈Nk:n1⋯nk≤x}, where F:Nk→C is a given function. In particular, we deduce asymptotic formulas with remainder terms for the hyperbolic summations ∑n1⋯nk≤xf((n1,…,nk)) and ∑n1⋯nk≤xf([n1,…,nk]), involving the GCD and LCM of the integers n1,…,nk, where f:...