output

namesCount before is 10
There are 2 refs for mach_thread_self and 2 refs for task_self_trap()
There are 1002 refs for mach_thread_self and 1002 refs for task_self_trap()
namesCount after is 10
new thread started
numKRefs for new thread is 2
sophiawisdom@Sophias-MacBook-Pro tweaks %

test_release.c

#include <mach/mach_traps.h>
#include <mach/mach_types.h>
#include <mach/port.h>
#include <pthread.h>

#define nil ((void *)0)

void test_newthread(void *arg) {
    printf("new thread started\n");
    int k = mach_thread_self();
    int numKRefs;
    mach_port_get_refs(mach_task_self(), k, MACH_PORT_RIGHT_SEND, &numKRefs);
    printf("numKRefs for new thread is %d\n", numKRefs);
}

int main() {
    mach_port_name_array_t names;
    int namesCount;
    mach_port_type_array_t types;
    int typesCount;
    mach_port_names(mach_task_self(), &names, &namesCount, &types, &typesCount);
    printf("namesCount before is %d\n", namesCount);

        int k = mach_thread_self();
        int j = task_self_trap();
    int numKRefs;
    int numJRefs;
    mach_port_get_refs(mach_task_self(), k, MACH_PORT_RIGHT_SEND, &numKRefs);
    mach_port_get_refs(mach_task_self(), k, MACH_PORT_RIGHT_SEND, &numJRefs);
    printf("There are %d refs for mach_thread_self and %d refs for task_self_trap()\n", numKRefs, numJRefs);

    for (int i = 0; i < 1000; i++) {
        k = mach_thread_self();
        j = task_self_trap();
    }

    mach_port_get_refs(mach_task_self(), k, MACH_PORT_RIGHT_SEND, &numKRefs);
    mach_port_get_refs(mach_task_self(), k, MACH_PORT_RIGHT_SEND, &numJRefs);
    printf("There are %d refs for mach_thread_self and %d refs for task_self_trap()\n", numKRefs, numJRefs);

    int newCount;
    mach_port_names(mach_task_self(), &names, &newCount, &types, &typesCount);
    printf("namesCount after is %d\n", namesCount);

    pthread_t testThread;
    pthread_create(&testThread, nil, test_newthread, nil);

    usleep(1000000);
}