Get number of threads (running) in all tasks on OS X

procinfo.c

#import <libproc.h>
#import <stdlib.h>
#import <stdio.h>

int main( int argc, const char * argv[])
{
	pid_t * pids = calloc(0x4000, 1);
	int count = proc_listallpids(pids, 0x4000);

	printf("count=%u\n", count) ;

	for( int index=0; index < count; ++index)
	{
		pid_t pid = pids[ index ] ;

		struct proc_taskinfo taskInfo ;
		/*int result*/ proc_pidinfo( pid, PROC_PIDTASKINFO, 0,  & taskInfo, sizeof( taskInfo ) ) ;

		// fields of taskInfo:
//			uint64_t		pti_virtual_size;	/* virtual memory size (bytes) */
//			uint64_t		pti_resident_size;	/* resident memory size (bytes) */
//			uint64_t		pti_total_user;		/* total time */
//			uint64_t		pti_total_system;
//			uint64_t		pti_threads_user;	/* existing threads only */
//			uint64_t		pti_threads_system;
//			int32_t			pti_policy;		/* default policy for new threads */
//			int32_t			pti_faults;		/* number of page faults */
//			int32_t			pti_pageins;		/* number of actual pageins */
//			int32_t			pti_cow_faults;		/* number of copy-on-write faults */
//			int32_t			pti_messages_sent;	/* number of messages sent */
//			int32_t			pti_messages_received;	/* number of messages received */
//			int32_t			pti_syscalls_mach;	/* number of mach system calls */
//			int32_t			pti_syscalls_unix;	/* number of unix system calls */
//			int32_t			pti_csw;          	/* number of context switches */
//			int32_t			pti_threadnum;		/* number of threads in the task */
//			int32_t			pti_numrunning;		/* number of running threads */
//			int32_t			pti_priority;		/* task priority*/

		printf("PID %u\t%s:\n", pid, BSDInfo.pbi_name);
		printf("\t%20s\t%u\n", "number of threads", taskInfo.pti_threadnum) ;
		printf("\t%20s\t%u\n", "number running threads", taskInfo.pti_numrunning) ;

		printf("\n") ;
	}

	return EXIT_SUCCESS ;
}