threads

# Copyright (C) Igor Sysoev
# Copyright (C) NGINX, Inc.


case "$NXT_SYSTEM" in

    Linux)
        NXT_PTHREAD="-lpthread"
    ;;

    FreeBSD)
        # FreeBSD libc supports only pthread stubs.
        NXT_PTHREAD="-lpthread"
    ;;

    SunOS)
        case "$NXT_SYSTEM_VERSION" in
        5.8 | 5.9)
            NXT_PTHREAD="-lpthread"
        ;;
        *)
            # Solaris 10 libpthread.so.1 is a filter to libc.so.1.
            NXT_PTHREAD=
        ;;
        esac
    ;;

    Darwin)
        # MacOSX libpthread.dylib is a symlink to libSystem.dylib.
        NXT_PTHREAD=
    ;;

    *)
        NXT_PTHREAD="-lpthread"
    ;;
esac


# Linux, FreeBSD.

nxt_feature="pthread_yield()"
nxt_feature_name=NXT_HAVE_PTHREAD_YIELD
nxt_feature_run=
nxt_feature_incs=
nxt_feature_libs=$NXT_PTHREAD
nxt_feature_test="#define _GNU_SOURCE
              #include <pthread.h>

              int main(void) {
                  pthread_yield();
                  return 0;
              }"
. auto/feature


if [ $nxt_found = no ]; then

    # MacOSX.

    nxt_feature="pthread_yield_np()"
    nxt_feature_name=NXT_HAVE_PTHREAD_YIELD_NP
    nxt_feature_run=
    nxt_feature_incs=
    nxt_feature_libs=$NXT_PTHREAD
    nxt_feature_test="#include <pthread.h>

                  int main(void) {
                      pthread_yield_np();
                      return 0;
                  }"
    . auto/feature
fi


# FreeBSD, Solaris, AIX.

nxt_feature="pthread spinlock"
nxt_feature_name=NXT_HAVE_PTHREAD_SPINLOCK
nxt_feature_run=yes
nxt_feature_incs=
nxt_feature_libs=$NXT_PTHREAD
nxt_feature_test="#include <pthread.h>

              int main(void) {
                  pthread_spinlock_t  lock;

                  if (pthread_spin_init(&lock, PTHREAD_PROCESS_PRIVATE) != 0)
                      return 1;
                  if (pthread_spin_lock(&lock) != 0)
                      return 1;
                  if (pthread_spin_unlock(&lock) != 0)
                      return 1;
                  if (pthread_spin_destroy(&lock) != 0)
                      return 1;
                  return 0;
              }"
. auto/feature


if [ $nxt_found = yes ]; then

    # Linux glibc uses 0 as pthread_spinlock_t initial value on the most
    # platforms.  However, on i386 and x86_64 the initial value is 1.

    nxt_feature="pthread spinlock zero initial value"
    nxt_feature_name=NXT_HAVE_PTHREAD_SPINLOCK_ZERO
    nxt_feature_run=yes
    nxt_feature_incs=
    nxt_feature_libs=$NXT_PTHREAD
    nxt_feature_test="#include <pthread.h>

                      pthread_spinlock_t  lock = 0;

                      int main(void) {
                          if (pthread_spin_trylock(&lock) != 0)
                              return 1;
                          if (pthread_spin_unlock(&lock) != 0)
                              return 1;
                          return 0;
                      }"
    . auto/feature
fi


nxt_feature="sem_timedwait()"
nxt_feature_name=NXT_HAVE_SEM_TIMEDWAIT
nxt_feature_run=yes
nxt_feature_incs=
nxt_feature_libs=
nxt_feature_test="#include <semaphore.h>

                  int main(void) {
                      sem_t            sem;
                      struct timespec  ts;

                      if (sem_init(&sem, 0, 0) != 0)
                          return 1;
                      if (sem_post(&sem) != 0)
                          return 1;

                      ts.tv_sec = 0;
                      ts.tv_nsec = 0;
                      if (sem_timedwait(&sem, &ts) != 0)
                          return 1;

                      if (sem_destroy(&sem) != 0)
                          return 1;
                      return 0;
                  }"
. auto/feature


if [ $nxt_found = no ]; then

    if [ -n "$NXT_PTHREAD" ]; then

        # Linux requires libpthread.

        nxt_feature="sem_timedwait() in libpthread"
        nxt_feature_libs=$NXT_PTHREAD
        . auto/feature
    fi

    if [ $nxt_found = no ]; then

        # Solaris 10 requires librt.

        nxt_feature="sem_timedwait() in librt"
        nxt_feature_libs="-lrt"
        . auto/feature

        if [ $nxt_found = yes ]; then
            NXT_LIBRT="-lrt"
        fi
    fi
fi


# Thread Local Storage / Thread Specific Data.
#
# Linux, FreeBSD 5.3, Solaris.
# MacOSX 10.7 (Lion) Clang.

nxt_feature="__thread"
nxt_feature_name=NXT_HAVE_THREAD_STORAGE_CLASS
nxt_feature_run=yes
nxt_feature_incs=
nxt_feature_libs=$NXT_PTHREAD
nxt_feature_test="#include <pthread.h>
                  #include <stdlib.h>

                  __thread int  key;

                  void *func(void *p);

                  void *func(void *p) {
                      key = 0x9abcdef0;
                      return NULL;
                  }

                  int main(void) {
                      void       *n;
                      pthread_t  pt;

                      key = 0x12345678;
                      if (pthread_create(&pt, NULL, func, NULL))
                          return 1;
                      if (pthread_join(pt, &n))
                          return 1;
                      if (key != 0x12345678)
                          return 1;
                      return 0;
                  }"
. auto/feature


if [ $nxt_found = no ]; then

    # MacOSX GCC lacks __thread support.
    # On NetBSD __thread causes segmentation fault.

    nxt_feature="phtread_key_t"
    nxt_feature_name=NXT_HAVE_PTHREAD_SPECIFIC_DATA
    nxt_feature_run=yes
    nxt_feature_incs=
    nxt_feature_libs=$NXT_PTHREAD
    nxt_feature_test="#include <pthread.h>

                      int main(void) {
                          pthread_key_t  key = -1;

                          if (pthread_key_create(&key, NULL))
                              return 1;
                          if (pthread_setspecific(key, (void *) 0x12345678))
                              return 1;
                          if (pthread_getspecific(key) != (void *) 0x12345678)
                              return 1;
                          return 0;
                      }"
    . auto/feature


    nxt_feature="PTHREAD_KEYS_MAX"
    nxt_feature_name=
    nxt_feature_run=value
    nxt_feature_incs=
    nxt_feature_libs=
    nxt_feature_test="#include <limits.h>
                      #include <pthread.h>
                      #include <stdio.h>

                      int main(void) {
                          printf(\"%d\", PTHREAD_KEYS_MAX);
                          return 0;
                      }"
    . auto/feature
fi