Added support for library initialization and finalization, and verification

that the initializer completed successfully.  Delay initialization on POSIX
until the first "verification" call.  Currently specific to a few platforms,
but should still build on others without thread support enabled.

Use it to finish creating (if necessary) and destroy mutexes, and free some
other storage "permanently" allocated by libraries (currently, libkrb5
cache/keytab type registries only).  Change initialization of static mutexes to
a two-step operation, a static "partial" initializer and a "finish_init"
routine called from a thread-safe environment like library initialization is
assumed to be.  POSIX will use the former, Windows will use the latter, and the
debug support will check that *both* have been used.

Added init/fini functions to com_err, profile, krb5, and gssapi libraries.
(The profile library one may need to be removed later.)  The existing ones, not
thread-safe, are still around.

Use weak symbol support if available to figure out if the pthread library has
been linked in, and avoid calling certain routines if the C library stubs are
known not to exist or work.

Stub declarations for thread-specific data.
Minor bugfixes, whitespace changes.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@16268 dc483132-0cff-0310-8789-dd5450dbe970

1 files changed, 21 insertions, 7 deletions

diff --git a/src/lib/gssapi/gss_libinit.c b/src/lib/gssapi/gss_libinit.c
index 0568f2964..fb80c8946 100644
--- a/src/lib/gssapi/gss_libinit.c
+++ b/src/lib/gssapi/gss_libinit.c
@@ -5,6 +5,7 @@
 #include "gssapiP_krb5.h"
 
 #include "gss_libinit.h"
+#include "k5-platform.h"
 
 static	int		initialized = 0;
 
@@ -12,19 +13,33 @@ static	int		initialized = 0;
  * Initialize the GSSAPI library.
  */
 
+MAKE_INIT_FUNCTION(gssint_lib_init);
+MAKE_FINI_FUNCTION(gssint_lib_fini);
+
+int gssint_lib_init(void)
+{
+    return k5_mutex_finish_init(&kg_vdb.mutex);
+}
+
+void gssint_lib_fini(void)
+{
+    if (!INITIALIZER_RAN(gssint_lib_init) || PROGRAM_EXITING())
+	return;
+    k5_mutex_destroy(&kg_vdb.mutex);
+}
+
 OM_uint32 gssint_initialize_library (void)
 {
-	
 	if (!initialized) {
 #if !USE_BUNDLE_ERROR_STRINGS
 	    add_error_table(&et_k5g_error_table);
 	    add_error_table(&et_ggss_error_table);
 #endif
 
-		initialized = 1;
+	    initialized = 1;
 	}
-	
-	return 0;
+
+	return CALL_INIT_FUNCTION(gssint_lib_init);
 }
 
 /*
@@ -33,13 +48,12 @@ OM_uint32 gssint_initialize_library (void)
 
 void gssint_cleanup_library (void)
 {
-
 	assert (initialized);
-	
+
 #if !USE_BUNDLE_ERROR_STRINGS
 	remove_error_table(&et_k5g_error_table);
 	remove_error_table(&et_ggss_error_table);
 #endif
-	
+
 	initialized = 0;
 }