weird output when I use pthread and printf

Question

I write a program using pthread.

Environment:windows 7 , CYGWIN_NT-6.1 i686 Cygwin , gcc (GCC) 4.5.3

The source code

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Answer 1

I will put this in a simple way you have two threads which are trying to access a resource. And also there is no kinds priority checks or anything like a mutex. Theoretically, threads without mutex or priority gets assigned with resources randomly. try creating two threads with one thread printing yes and the other one printing no. you will find this unusual behavior. Also remember running time is different for different threads in this case. If you try the same stuff with one thread writing the info to a file and other guy writing to console. You will not encounter such an issue. Hope that helps....