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#include <unistd.h>
#include <sys/types.h>
#include <pthread.h>

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

#define ERR_EXIT(m) \
        do \
        { \
                perror(m); \
                exit(EXIT_FAILURE); \
        } while(0)

int main(void)
{
    pthread_attr_t attr;
    pthread_attr_init(&attr);

int state;
    pthread_attr_getdetachstate(&attr, &state);
    if (state == PTHREAD_CREATE_JOINABLE)
        printf("detachstate:PTHREAD_CREATE_JOINABLE\n");
    else if (state == PTHREAD_CREATE_DETACHED)
        printf("detachstate:PTHREAD_CREATE_DETACHED");

size_t size;
    pthread_attr_getstacksize(&attr, &size);
    printf("stacksize:%d\n", size);

pthread_attr_getguardsize(&attr, &size);
    printf("guardsize:%d\n", size);

int scope;
    pthread_attr_getscope(&attr, &scope);
    if (scope == PTHREAD_SCOPE_PROCESS)
        printf("scope:PTHREAD_SCOPE_PROCESS\n");
    if (scope == PTHREAD_SCOPE_SYSTEM)
        printf("scope:PTHREAD_SCOPE_SYSTEM\n");

int policy;
    pthread_attr_getschedpolicy(&attr, &policy);
    if (policy == SCHED_FIFO)
        printf("policy:SCHED_FIFO\n");
    else if (policy == SCHED_RR)
        printf("policy:SCHED_RR\n");
    else if (policy == SCHED_OTHER)
        printf("policy:SCHED_OTHER\n");

int inheritsched;
    pthread_attr_getinheritsched(&attr, &inheritsched);
    if (inheritsched == PTHREAD_INHERIT_SCHED)
        printf("inheritsched:PTHREAD_INHERIT_SCHED\n");
    else if (inheritsched == PTHREAD_EXPLICIT_SCHED)
        printf("inheritsched:PTHREAD_EXPLICIT_SCHED\n");

struct sched_param param;
    pthread_attr_getschedparam(&attr, &param);
    printf("sched_priority:%d\n", param.sched_priority);

pthread_attr_destroy(&attr);

return 0;
}

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#include <unistd.h>
#include <sys/types.h>
#include <pthread.h>

#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

#define ERR_EXIT(m) \
        do \
        { \
                perror(m); \
                exit(EXIT_FAILURE); \
        } while(0)

typedef struct tsd
{
    pthread_t tid;
    char *str;
} tsd_t;

pthread_key_t key_tsd;
pthread_once_t once_control = PTHREAD_ONCE_INIT;

void destroy_routine(void *value)
{
    printf("destory ...\n");
    free(value);
}

void once_routine(void)
{
    pthread_key_create(&key_tsd, destroy_routine);
    printf("key init ...\n");
}

void *thread_routine(void *arg)
{
    pthread_once(&once_control, once_routine);
    tsd_t *value = (tsd_t *)malloc(sizeof(tsd_t));
    value->tid = pthread_self();
    value->str = (char *)arg;

pthread_setspecific(key_tsd, value);
    printf("%s setspecific ptr=%p\n", (char *)arg, value);
    value = pthread_getspecific(key_tsd);
    printf("tid=0x%x str=%s ptr=%p\n", (int)value->tid, value->str, value);
    sleep(2);
    value = pthread_getspecific(key_tsd);
    printf("tid=0x%x str=%s ptr=%p\n", (int)value->tid, value->str, value);
    return NULL;
}

int main(void)
{
    //pthread_key_create(&key_tsd, destroy_routine);

pthread_t tid1;
    pthread_t tid2;
    pthread_create(&tid1, NULL, thread_routine, "thread1");
    pthread_create(&tid2, NULL, thread_routine, "thread2");

pthread_join(tid1, NULL);
    pthread_join(tid2, NULL);

pthread_key_delete(key_tsd);
    return 0;
}