During the porting of an application form Linux to FreeBSD I came up with the following problem. I need to get all thread id of all threads running inside my application. In terms of PThreads, I need an instance of an pthread_t array which contain all threads in my program (either PThreads or OpenMP) to send a signal using pthread_signal to them. The current Linux implementation uses a non portable workaround by traversing the procfs to obtain all pids of a process:
int foreach_pid(void (*func)(pid_t, void *aux),void*aux){
DIR *proc_dir;
char dirname[256];
pid_t pid;
if ( ! func ) return -1;
snprintf(dirname, sizeof(dirname), "/proc/%d/task", getpid());
proc_dir = opendir(dirname);
if (proc_dir) {
/* /proc available, iterate through tasks... */
struct dirent *entry;
while ((entry = readdir(proc_dir)) != NULL) {
if(entry->d_name[0] == '.')
continue;
pid = atoi(entry->d_name);
func(pid, aux);
}
closedir(proc_dir);
return 0;
} else {
return -1;
}
}
and uses the kill function to send the signals to all threads via their process ids. Obviously, this is not a portable to solution because even if linprocfs is mounted under FreeBSD it does not provide the task directory.
So what I am searching for is a routine/an interface/a library/a syscall to have a portable way to obtain similar information. Either as pid_t or preferable as pthread_t.
