Re: checkin of glthread/glcond modules

[Bruno Haible]

Some more changes in the 'thread' module:
  - glthread_create must return ENOSYS if no multithreading is available,
  - gl_thread_create calling convention: it should better simply return the
    created thread.

*** lib/glthread/thread.h.orig  2008-08-17 21:17:32.000000000 +0200
--- lib/glthread/thread.h       2008-08-17 21:17:24.000000000 +0200
***************
*** 24,30 ****
     Thread data type: gl_thread_t.
  
     Creating a thread:
!        gl_thread_create (thread, func, arg);
     Or with control of error handling:
         err = glthread_create (&thread, func, arg);
         extern int glthread_create (gl_thread_t *result,
--- 24,30 ----
     Thread data type: gl_thread_t.
  
     Creating a thread:
!        thread = gl_thread_create (func, arg);
     Or with control of error handling:
         err = glthread_create (&thread, func, arg);
         extern int glthread_create (gl_thread_t *result,
***************
*** 260,266 ****
  /* Provide dummy implementation if threads are not supported.  */
  
  typedef int gl_thread_t;
! # define glthread_create(THREADP, FUNC, ARG) 0
  # define glthread_sigmask(HOW, SET, OSET) 0
  # define glthread_join(THREAD, RETVALP) 0
  # define gl_thread_self() NULL
--- 260,266 ----
  /* Provide dummy implementation if threads are not supported.  */
  
  typedef int gl_thread_t;
! # define glthread_create(THREADP, FUNC, ARG) ENOSYS
  # define glthread_sigmask(HOW, SET, OSET) 0
  # define glthread_join(THREAD, RETVALP) 0
  # define gl_thread_self() NULL
***************
*** 274,293 ****
  
  /* Macros with built-in error handling.  */
  
! static inline int
! gl_thread_create_func (gl_thread_t * thread,
!                        void *(*func) (void *arg),
!                        void *arg)
  {
    int ret;
  
!   ret = glthread_create (thread, func, arg);
    if (ret != 0)
      abort ();
!   return ret;
  }
- #define gl_thread_create(THREAD, FUNC, ARG) \
-   gl_thread_create_func (&THREAD, FUNC, ARG)
  #define gl_thread_sigmask(HOW, SET, OSET)     \
     do                                         \
       {                                        \
--- 274,290 ----
  
  /* Macros with built-in error handling.  */
  
! static inline gl_thread_t
! gl_thread_create (void *(*func) (void *arg), void *arg)
  {
+   gl_thread_t thread;
    int ret;
  
!   ret = glthread_create (&thread, func, arg);
    if (ret != 0)
      abort ();
!   return thread;
  }
  #define gl_thread_sigmask(HOW, SET, OSET)     \
     do                                         \
       {                                        \