Consider the following code:
#include <stdio.h> #include <unistd.h> #include <pthread.h>
void *mythread (void *p)
{
puts ("Begin thread.");
sleep (2);
puts ("End thread.");
return NULL;
} int main (void)
{
pthread_t threadID;
puts ("Begin program.");
pthread_create (&threadID, NULL, mythread, NULL);
sleep(1);
puts ("Mid program.");
sleep (2);
puts ("End program.");
return 0;
}In my intention, it should write the following (the sleeps take care of the timing):
Begin program. Begin thread. Mid program. End thread. End program.
However, the last line (which is executed after the thread has exited) is not printed. I also tried with files and with redirection. If I repeat the "sleep(2)" twice in the main program, the program actually takes longer, so I am sure that execution of main still proceeds after the thread has stopped; however, the standard output seems to have been closed by the thread termination.
I have an up-to-date Cygwin system (1.5.11-1 DLL, GCC 3.3.3 with POSIX thread model); the compilation command that I used is
gcc -Wall -o ttest ttest.c
I also tried putting debug or optimization flags (-g, -O, -O2) and put an explicit "-lpthread" at the end, with no luck.
I'm a bit new to pthreads, so probably it's my fault, or maybe this behavior is in the specifications; however, under Linux I get the whole output as I expect. Is there a way to get things right?
Thank you,
Mauro.
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