kc3-lang/gnulib/lib/tls.h
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Hash : a897449a
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Date : 2006-08-14T22:19:54
Add copyright notices to long-enough files that lack them, since otherwise the files aren't clearly free. Use the same notice that getdate.texi already uses. * doc/alloca-opt.texi: Add copyright notice. * doc/alloca.texi: Likewise. * doc/ctime.texi: Likewise. * doc/functions.texi: Likewise. * doc/gcd.texi: Likewise. * doc/gnulib-tool.texi: Likewise. * doc/inet_ntoa.texi: Likewise. * doc/visibility.texi: Likewise. Change copyright notice from LGPL 2 to GPL 2, since that's the standard form used in the gnulib repository. * lib/lock.c: LGPL -> GPL. * lib/lock.h: Likewise. * lib/strnlen1.c: Likewise. * lib/strnlen1.h: Likewise. * lib/tls.c: Likewise. * lib/tls.h: Likewise. * lib/tmpdir.c: Likewise. * tests/test-lock.c: Likewise. * tests/test-stdint.c: Likewise. * tests/test-tls.c: Likewise.
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lib/tls.h
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/* Thread-local storage in multithreaded situations. Copyright (C) 2005 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ /* Written by Bruno Haible <bruno@clisp.org>, 2005. */ /* This file contains thread-local storage primitives for use with a given thread library. It does not contain primitives for creating threads or for other multithreading primitives. Type: gl_tls_key_t Initialization: gl_tls_key_init (name, destructor); Getting per-thread value: gl_tls_get (name) Setting per-thread value: gl_tls_set (name, pointer); De-initialization: gl_tls_key_destroy (name); A per-thread value is of type 'void *'. A destructor is a function pointer of type 'void (*) (void *)', called when a thread exits, and taking the last per-thread value as argument. It is unspecified whether the destructor function is called when the last per-thread value is NULL. On some platforms, the destructor function is not called at all. */ #ifndef _TLS_H #define _TLS_H /* ========================================================================= */ #if USE_POSIX_THREADS /* Use the POSIX threads library. */ # include <pthread.h> # include <stdlib.h> # if PTHREAD_IN_USE_DETECTION_HARD /* The pthread_in_use() detection needs to be done at runtime. */ # define pthread_in_use() \ glthread_in_use () extern int glthread_in_use (void); # endif # if USE_POSIX_THREADS_WEAK /* Use weak references to the POSIX threads library. */ # pragma weak pthread_key_create # pragma weak pthread_getspecific # pragma weak pthread_setspecific # pragma weak pthread_key_delete # ifndef pthread_self # pragma weak pthread_self # endif # if !PTHREAD_IN_USE_DETECTION_HARD # pragma weak pthread_cancel # define pthread_in_use() (pthread_cancel != NULL) # endif # else # if !PTHREAD_IN_USE_DETECTION_HARD # define pthread_in_use() 1 # endif # endif /* ------------------------- gl_tls_key_t datatype ------------------------- */ typedef union { void *singlethread_value; pthread_key_t key; } gl_tls_key_t; # define gl_tls_key_init(NAME, DESTRUCTOR) \ do \ { \ if (pthread_in_use ()) \ { \ if (pthread_key_create (&(NAME).key, DESTRUCTOR) != 0) \ abort (); \ } \ else \ (NAME).singlethread_value = NULL; \ } \ while (0) # define gl_tls_get(NAME) \ (pthread_in_use () \ ? pthread_getspecific ((NAME).key) \ : (NAME).singlethread_value) # define gl_tls_set(NAME, POINTER) \ do \ { \ if (pthread_in_use ()) \ { \ if (pthread_setspecific ((NAME).key, (POINTER)) != 0) \ abort (); \ } \ else \ (NAME).singlethread_value = (POINTER); \ } \ while (0) # define gl_tls_key_destroy(NAME) \ if (pthread_in_use () && pthread_key_delete ((NAME).key) != 0) \ abort () #endif /* ========================================================================= */ #if USE_PTH_THREADS /* Use the GNU Pth threads library. */ # include <pth.h> # include <stdlib.h> # if USE_PTH_THREADS_WEAK /* Use weak references to the GNU Pth threads library. */ # pragma weak pth_key_create # pragma weak pth_key_getdata # pragma weak pth_key_setdata # pragma weak pth_key_delete # pragma weak pth_cancel # define pth_in_use() (pth_cancel != NULL) # else # define pth_in_use() 1 # endif /* ------------------------- gl_tls_key_t datatype ------------------------- */ typedef union { void *singlethread_value; pth_key_t key; } gl_tls_key_t; # define gl_tls_key_init(NAME, DESTRUCTOR) \ do \ { \ if (pth_in_use ()) \ { \ if (!pth_key_create (&(NAME).key, DESTRUCTOR)) \ abort (); \ } \ else \ (NAME).singlethread_value = NULL; \ } \ while (0) # define gl_tls_get(NAME) \ (pth_in_use () \ ? pth_key_getdata ((NAME).key) \ : (NAME).singlethread_value) # define gl_tls_set(NAME, POINTER) \ do \ { \ if (pth_in_use ()) \ { \ if (!pth_key_setdata ((NAME).key, (POINTER))) \ abort (); \ } \ else \ (NAME).singlethread_value = (POINTER); \ } \ while (0) # define gl_tls_key_destroy(NAME) \ if (pth_in_use () && !pth_key_delete ((NAME).key)) \ abort () #endif /* ========================================================================= */ #if USE_SOLARIS_THREADS /* Use the old Solaris threads library. */ # include <thread.h> # include <stdlib.h> # if USE_SOLARIS_THREADS_WEAK /* Use weak references to the old Solaris threads library. */ # pragma weak thr_keycreate # pragma weak thr_getspecific # pragma weak thr_setspecific # pragma weak thr_suspend # define thread_in_use() (thr_suspend != NULL) # else # define thread_in_use() 1 # endif /* ------------------------- gl_tls_key_t datatype ------------------------- */ typedef union { void *singlethread_value; thread_key_t key; } gl_tls_key_t; # define gl_tls_key_init(NAME, DESTRUCTOR) \ do \ { \ if (thread_in_use ()) \ { \ if (thr_keycreate (&(NAME).key, DESTRUCTOR) != 0) \ abort (); \ } \ else \ (NAME).singlethread_value = NULL; \ } \ while (0) # define gl_tls_get(NAME) \ (thread_in_use () \ ? glthread_tls_get ((NAME).key) \ : (NAME).singlethread_value) extern void *glthread_tls_get (thread_key_t key); # define gl_tls_set(NAME, POINTER) \ do \ { \ if (thread_in_use ()) \ { \ if (thr_setspecific ((NAME).key, (POINTER)) != 0) \ abort (); \ } \ else \ (NAME).singlethread_value = (POINTER); \ } \ while (0) # define gl_tls_key_destroy(NAME) \ /* Unsupported. */ \ (void)0 #endif /* ========================================================================= */ #if USE_WIN32_THREADS # include <windows.h> /* ------------------------- gl_tls_key_t datatype ------------------------- */ typedef DWORD gl_tls_key_t; # define gl_tls_key_init(NAME, DESTRUCTOR) \ /* The destructor is unsupported. */ \ if (((NAME) = TlsAlloc ()) == (DWORD)-1) \ abort () # define gl_tls_get(NAME) \ TlsGetValue (NAME) # define gl_tls_set(NAME, POINTER) \ if (!TlsSetValue (NAME, POINTER)) \ abort () # define gl_tls_key_destroy(NAME) \ if (!TlsFree (NAME)) \ abort () #endif /* ========================================================================= */ #if !(USE_POSIX_THREADS || USE_PTH_THREADS || USE_SOLARIS_THREADS || USE_WIN32_THREADS) /* Provide dummy implementation if threads are not supported. */ /* ------------------------- gl_tls_key_t datatype ------------------------- */ typedef struct { void *singlethread_value; } gl_tls_key_t; # define gl_tls_key_init(NAME, DESTRUCTOR) \ (NAME).singlethread_value = NULL # define gl_tls_get(NAME) \ (NAME).singlethread_value # define gl_tls_set(NAME, POINTER) \ (NAME).singlethread_value = (POINTER) # define gl_tls_key_destroy(NAME) \ (void)0 #endif /* ========================================================================= */ #endif /* _TLS_H */