semaphore - Sometimes out of 5 times, 2-3 times, Threads gets deadlock in waitforsingleobject -

i have 2 thread t1 , t2 tries print alrenatively through semaphore signaling. each thread prints 10 times, sometime, both gets blocked @ waitforsingleobject , not print anything. doing wrong.can please let me know how solve , rid of problem.

handle hthreadsemaphore1,hthreadsemaphore2;    void t1(void *param) {         static int i=0;     releasesemaphore(hthreadsemaphore2, 1, null);             bool success = setthreadaffinitymask(getcurrentthread(),1);          _tprintf (_t("setthreadaffinitymask passed: %d\n"), getlasterror());         if(success ==0) {             _tprintf (_t("setting thread affinity t1 not done\n"));         }         while(i!=10) {         waitforsingleobject(hthreadsemaphore2,infinite);         i++;         printf("thread 1 running %d!\n",i);         releasesemaphore(hthreadsemaphore1, 1, null);     }           _endthread();  } 

t2:

void t2(void *param) {     static int i=0;     bool success = setthreadaffinitymask(getcurrentthread(),1);      _tprintf (_t("setthreadaffinitymask passed: %d\n"), getlasterror());     if(success ==0) {         _tprintf (_t("setting thread affinity t1 not done\n"));     }     while(i!=10) {         waitforsingleobject(hthreadsemaphore1,infinite);         i++;         printf("thread 2 running %d!\n",i);         releasesemaphore(hthreadsemaphore2, 1, null);     }     _endthread(); } 

main

int _tmain(int argc, _tchar* argv[]) {       unsigned long val1,val2;     handle handle1,handle2;     handle1 = (handle) _beginthreadex(null,0,  (unsigned int (__stdcall *)(void *))t1,null,0,(unsigned int*)&val1); // create thread     char semname[80];     sprintf(semname, "threadsem_0x%x",val1);     hthreadsemaphore1 = createsemaphore(null, 0, 5,(lpcwstr) semname);      handle2 = (handle) _beginthreadex(null,0,  (unsigned int (__stdcall *)(void *))t2,null,0,(unsigned int*)&val2); // create thread     sprintf(semname, "threadsem_0x%x",val2);     hthreadsemaphore2 = createsemaphore(null, 0, 5,(lpcwstr) semname);       handle process = getcurrentprocess();      getch();     return 0; } 

i think need create both semaphores before create (and run) threads. i'm assuming _beginthreadex starts thread running immediately...

if check return codes semaphore takes , gives, on runs deadlocks, errors returned? i'm thinking threads have started before semaphores created...