Provide a libsmbclient interface for programs requiring threads

- This adds two functions: smbc_thread_posix() which provides access to the
  internal threading implementation using pthread; and smbc_thread_impl()
  where the user provides each of the functions required by Samba, to give
  access to the thread implementation's native capabilities.

Derrell

2 files changed, 176 insertions, 0 deletions

diff --git a/source3/libsmb/libsmb_thread_impl.c b/source3/libsmb/libsmb_thread_impl.c
new file mode 100644
index 0000000000..c0ed636211
--- /dev/null
+++ b/source3/libsmb/libsmb_thread_impl.c
@@ -0,0 +1,127 @@
+/* 
+   Unix SMB/Netbios implementation.
+   SMB client library implementation
+   Copyright (C) Derrell Lipman 2009
+   
+   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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "libsmbclient.h"
+#include "libsmb_internal.h"
+
+
+/**
+ * Initialize for an arbitrary thread implementation. The caller should
+ * provide, as parameters, pointers to functions to implement the requisite
+ * low-level thread functionality. A function must be provided for each
+ * parameter; none may be null.
+ *
+ * If the thread implementation is POSIX Threads (pthreads), then the much
+ * simpler smbc_thread_pthread() function may be used instead of this one.
+ *
+ * @param create_mutex
+ *   Create a mutex. This function should expect three parameters: lockname,
+ *   pplock, and location. It should create a unique mutex for each unique
+ *   lockname it is provided, and return the mutex identifier in *pplock. The
+ *   location parameter can be used for debugging, as it contains the
+ *   compiler-provided __location__ of the call.
+ *
+ * @param destroy_mutex
+ *   Destroy a mutex. This function should expect two parameters: plock and
+ *   location. It should destroy the mutex associated with the identifier
+ *   plock. The location parameter can be used for debugging, as it contains
+ *   the compiler-provided __location__ of the call.
+ *
+ * @param lock_mutex
+ *   Lock a mutex. This function should expect three parameters: plock,
+ *   lock_type, and location. The mutex aassociated with identifier plock
+ *   should be locked if lock_type is 1, and unlocked if lock_type is 2. The
+ *   location parameter can be used for debugging, as it contains the
+ *   compiler-provided __location__ of the call.
+ *
+ * @param create_tls
+ *   Create thread local storage. This function should expect three
+ *   parameters: keyname, ppkey, and location. It should allocate an
+ *   implementation-specific amount of memory and assign the pointer to that
+ *   allocated memory to *ppkey. The location parameter can be used for
+ *   debugging, as it contains the compiler-provided __location__ of the
+ *   call. This function should return 0 upon success, non-zero upon failure.
+ *
+ * @param destroy_tls
+ *   Destroy thread local storage. This function should expect two parameters:
+ *   ppkey and location. The ppkey parameter points to a variable containing a
+ *   thread local storage key previously provided by the create_tls
+ *   function. The location parameter can be used for debugging, as it
+ *   contains the compiler-provided __location__ of the call.
+ *
+ * @param set_tls
+ *   Set a thread local storage variable's value. This function should expect
+ *   three parameters: pkey, pval, and location. The pkey parameter is a
+ *   thread local storage key previously provided by the create_tls
+ *   function. The (void *) pval parameter contains the value to be placed in
+ *   the thread local storage variable identified by pkey. The location
+ *   parameter can be used for debugging, as it contains the compiler-provided
+ *   __location__ of the call. This function should return 0 upon success;
+ *   non-zero otherwise.
+ *
+ * @param get_tls
+ *   Retrieve a thread local storage variable's value. This function should
+ *   expect two parameters: pkey and location. The pkey parameter is a thread
+ *   local storage key previously provided by the create_tls function, and
+ *   which has previously been used in a call to the set_tls function to
+ *   initialize a thread local storage variable. The location parameter can be
+ *   used for debugging, as it contains the compiler-provided __location__ of
+ *   the call. This function should return the (void *) value stored in the
+ *   variable identified by pkey.
+ *
+ * @return {void}
+ */
+void
+smbc_thread_impl(
+        /* Mutex functions. */
+        int (*create_mutex)(const char *lockname,
+                            void **pplock,
+                            const char *location),
+        void (*destroy_mutex)(void *plock,
+                              const char *location),
+        int (*lock_mutex)(void *plock,
+                          int lock_type,
+                          const char *location),
+    
+        /* Thread local storage. */
+        int (*create_tls)(const char *keyname,
+                          void **ppkey,
+                          const char *location),
+        void (*destroy_tls)(void **ppkey,
+                            const char *location),
+        int (*set_tls)(void *pkey,
+                       const void *pval,
+                       const char *location),
+        void *(*get_tls)(void *pkey,
+                         const char *location)
+        )
+{
+        static struct smb_thread_functions tf;
+
+        tf.create_mutex  = create_mutex;
+        tf.destroy_mutex = destroy_mutex;
+        tf.lock_mutex    = lock_mutex;
+        tf.create_tls    = create_tls;
+        tf.destroy_tls   = destroy_tls;
+        tf.set_tls       = set_tls;
+        tf.get_tls       = get_tls;
+
+        smb_thread_set_functions(&tf);
+}
diff --git a/source3/libsmb/libsmb_thread_posix.c b/source3/libsmb/libsmb_thread_posix.c
new file mode 100644
index 0000000000..411ffbdfbb
--- /dev/null
+++ b/source3/libsmb/libsmb_thread_posix.c
@@ -0,0 +1,49 @@
+/* 
+   Unix SMB/Netbios implementation.
+   SMB client library implementation
+   Copyright (C) Derrell Lipman 2009
+   
+   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 3 of the License, 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <pthread.h>
+#include "includes.h"
+#include "libsmbclient.h"
+#include "libsmb_internal.h"
+
+
+/* Get rid of the malloc checker */
+#ifdef malloc
+#undef malloc
+#endif
+
+/*
+ * Define the functions which implement the pthread interface
+ */
+SMB_THREADS_DEF_PTHREAD_IMPLEMENTATION(tf);
+
+
+/**
+ * Initialize for threads using the Posix Threads (pthread)
+ * implementation. This is a built-in implementation, avoiding the need to
+ * implement the component functions of the thread interface. If this function
+ * is used, it is not necessary to call smbc_thread_impl().
+ *
+ * @return {void}
+ */
+void
+smbc_thread_posix(void)
+{
+        smb_thread_set_functions(&tf);
+}