globals: add globals.h/c THIS: macro to access thread specific current xlator CTX: macro to access glusterfs global context (glusterfs_ctx_t)

Signed-off-by: Anand V. Avati <avati@amp.gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

3 files changed, 209 insertions, 2 deletions

diff --git a/libglusterfs/src/Makefile.am b/libglusterfs/src/Makefile.am
index 8ff35fbb27a..7698661fa42 100644
--- a/libglusterfs/src/Makefile.am
+++ b/libglusterfs/src/Makefile.am
@@ -6,9 +6,9 @@ libglusterfs_la_LIBADD = @LEXLIB@
 
 lib_LTLIBRARIES = libglusterfs.la
 
-libglusterfs_la_SOURCES = dict.c spec.lex.c y.tab.c xlator.c logging.c  hashfn.c defaults.c scheduler.c common-utils.c transport.c timer.c inode.c call-stub.c compat.c authenticate.c fd.c compat-errno.c event.c mem-pool.c gf-dirent.c syscall.c iobuf.c
+libglusterfs_la_SOURCES = dict.c spec.lex.c y.tab.c xlator.c logging.c  hashfn.c defaults.c scheduler.c common-utils.c transport.c timer.c inode.c call-stub.c compat.c authenticate.c fd.c compat-errno.c event.c mem-pool.c gf-dirent.c syscall.c iobuf.c globals.c
 
-noinst_HEADERS = common-utils.h defaults.h dict.h glusterfs.h hashfn.h logging.h protocol.h scheduler.h xlator.h transport.h stack.h timer.h list.h inode.h call-stub.h compat.h authenticate.h fd.h revision.h compat-errno.h event.h mem-pool.h byte-order.h gf-dirent.h locking.h syscall.h iobuf.h
+noinst_HEADERS = common-utils.h defaults.h dict.h glusterfs.h hashfn.h logging.h protocol.h scheduler.h xlator.h transport.h stack.h timer.h list.h inode.h call-stub.h compat.h authenticate.h fd.h revision.h compat-errno.h event.h mem-pool.h byte-order.h gf-dirent.h locking.h syscall.h iobuf.h globals.h
 
 EXTRA_DIST = spec.l spec.y
 
diff --git a/libglusterfs/src/globals.c b/libglusterfs/src/globals.c
new file mode 100644
index 00000000000..38727a25afe
--- /dev/null
+++ b/libglusterfs/src/globals.c
@@ -0,0 +1,166 @@
+/*
+   Copyright (c) 2009 Z RESEARCH, Inc. <http://www.zresearch.com>
+   This file is part of GlusterFS.
+
+   GlusterFS 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 3 of the License,
+   or (at your option) any later version.
+
+   GlusterFS 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, see
+   <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif /* !_CONFIG_H */
+
+#include <pthread.h>
+
+#include "globals.h"
+#include "glusterfs.h"
+#include "xlator.h"
+
+
+/* CTX */
+static glusterfs_ctx_t *glusterfs_ctx;
+
+
+int
+glusterfs_ctx_init ()
+{
+        int  ret = 0;
+
+        if (glusterfs_ctx)
+                goto out;
+
+        glusterfs_ctx = CALLOC (1, sizeof (*glusterfs_ctx));
+        if (!glusterfs_ctx) {
+                ret = -1;
+                goto out;
+        }
+
+        ret = pthread_mutex_init (&glusterfs_ctx->lock, NULL);
+
+out:
+        return ret;
+}
+
+
+glusterfs_ctx_t *
+glusterfs_ctx_get ()
+{
+        return glusterfs_ctx;
+
+}
+
+
+/* THIS */
+
+xlator_t global_xlator;
+static pthread_key_t this_xlator_key;
+
+void
+glusterfs_this_destroy (void *ptr)
+{
+        if (ptr)
+                FREE (ptr);
+}
+
+
+int
+glusterfs_this_init ()
+{
+        int  ret = 0;
+
+        ret = pthread_key_create (&this_xlator_key, glusterfs_this_destroy);
+        if (ret != 0) {
+                return ret;
+        }
+
+        global_xlator.name = "glusterfs";
+        global_xlator.type = "global";
+
+        return ret;
+}
+
+
+xlator_t **
+__glusterfs_this_location ()
+{
+        xlator_t **this_location = NULL;
+        int        ret = 0;
+
+        this_location = pthread_getspecific (this_xlator_key);
+
+        if (!this_location) {
+                this_location = CALLOC (1, sizeof (*this_location));
+                if (!this_location)
+                        goto out;
+
+                ret = pthread_setspecific (this_xlator_key, this_location);
+                if (ret != 0) {
+                        FREE (this_location);
+                        this_location = NULL;
+                        goto out;
+                }
+        }
+out:
+        if (this_location) {
+                if (!*this_location)
+                        *this_location = &global_xlator;
+        }
+        return this_location;
+}
+
+
+xlator_t *
+glusterfs_this_get ()
+{
+        xlator_t **this_location = NULL;
+
+        this_location = __glusterfs_this_location ();
+        if (!this_location)
+                return &global_xlator;
+
+        return *this_location;
+}
+
+
+int
+glusterfs_this_set (xlator_t *this)
+{
+        xlator_t **this_location = NULL;
+
+        this_location = __glusterfs_this_location ();
+        if (!this_location)
+                return -ENOMEM;
+
+        *this_location = this;
+
+        return 0;
+}
+
+
+int
+glusterfs_globals_init ()
+{
+        int ret = 0;
+
+        ret = glusterfs_ctx_init ();
+        if (ret)
+                goto out;
+
+        ret = glusterfs_this_init ();
+        if (ret)
+                goto out;
+out:
+        return ret;
+}
diff --git a/libglusterfs/src/globals.h b/libglusterfs/src/globals.h
new file mode 100644
index 00000000000..f4d252dd9b5
--- /dev/null
+++ b/libglusterfs/src/globals.h
@@ -0,0 +1,41 @@
+/*
+   Copyright (c) 2009 Z RESEARCH, Inc. <http://www.zresearch.com>
+   This file is part of GlusterFS.
+
+   GlusterFS 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 3 of the License,
+   or (at your option) any later version.
+
+   GlusterFS 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, see
+   <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef _GLOBALS_H
+#define _GLOBALS_H
+
+#include "glusterfs.h"
+#include "xlator.h"
+
+/* CTX */
+#define CTX (glusterfs_ctx_get())
+
+glusterfs_ctx_t *glusterfs_ctx_get ();
+
+/* THIS */
+#define THIS (*__glusterfs_this_location())
+
+xlator_t **__glusterfs_this_location ();
+xlator_t *glusterfs_this_get ();
+int glusterfs_this_set (xlator_t *);
+
+/* init */
+int glusterfs_globals_init (void);
+
+#endif /* !_GLOBALS_H */