c - Why is this code blocking? -


i have code takes short while complete. i'd handled on separate thread blocked io. implemented following, when calling thread runs background_picture_save(), seems block. why?

i'm trying save_picture() function work background process.

static void * threaded_save_picture(void * p); static void * threaded_save_picture(void * p)  {     char optarg[512];      strncpy(optarg, p, sizeof optarg);  optarg[sizeof optarg - 1] = '\0';     fprintf(stderr,"%s()::%s\n",__function__,optarg);     save_picture(optarg);     pthread_detach(pthread_self());     return(p); } /* threaded_save_picture() */  extern void background_picture_save(const char * const optarg); void background_picture_save(const char * const optarg) {     pthread_t thrd;     (void)pthread_create(& thrd, null, threaded_save_picture, (void *) optarg); } /* background_picture_save() */

take ambiguity out of observations.

run program gdb, when main thread blocks print backtrace "where".

use strace show system calls being made when blocking.

use systemtap http://sourceware.org/systemtap/ show kernel backtraces blocked process (although see pthreads support went in http://www.cygwin.com/ml/libc-alpha/2011-01/threads.html#00010).


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