2004-06-11 Antony King <antony.king@st.com>

        * libc/include/sys/_types.h: Include <sys/lock.h> and change
        _flock_t to be of type _LOCK_RECURSIVE_T.
        * libc/include/sys/reent.h: (_REENT_INIT): Reformat.
        (_REENT_INIT_PTR): Ditto.  Use memset where appropriate.
        (_global_impure_ptr): New declaration.
        (_GLOBAL_REENT): Change to be _global_impure_ptr.
        * libc/include/sys/stdio.h: Include <sys/lock.h> and
        <sys/reent.h>.
        (_flockfile)[!_SINGLE_THREAD]: Add code for lock call.
        (_funlockfile)[!SINGLE_THREAD]: Ditto.
        * libc/reent/impure.c: Set _global_impure_ptr to _impure_ptr.
        * libc/stdio/fclose.c: Remove casting of fp lock to
        _LOCK_RECURSIVE_T.
        * libc/stdio/findfp.c: Ditto.
        * libc/stdio/fopen.c: Ditto.
        * libc/stdio/freopen.c: Ditto.
        * libc/stdio/vfprintf.c: Ditto.
        * libc/stdio64/fopen64.c: Ditto.
        * libc/stdlib/envlock.c: Add default stubs that use generic
        locking code.
        * libc/stdlib/mlock.c: Ditto.

        Jeff Johnston  <jjohnstn@redhat.com>
        * libc/sys/linux/sys/_types.h (__flock_mutex_t): New subtype.
        (_flock_t): Change to be a struct containing a single member
        named mutex which is of type __flock_mutex_t.

1 files changed, 21 insertions, 11 deletions

diff --git a/newlib/libc/stdlib/envlock.c b/newlib/libc/stdlib/envlock.c
index 8e55de288..24d0083be 100644
--- a/newlib/libc/stdlib/envlock.c
+++ b/newlib/libc/stdlib/envlock.c
@@ -9,24 +9,24 @@ INDEX
 
 ANSI_SYNOPSIS
 	#include "envlock.h"
-       void __env_lock (struct _reent *<[reent]>);
-       void __env_unlock (struct _reent *<[reent]>);
+	void __env_lock (struct _reent *<[reent]>);
+	void __env_unlock (struct _reent *<[reent]>);
 
 TRAD_SYNOPSIS
 	void __env_lock(<[reent]>)
-       struct _reent *<[reent]>;
+	struct _reent *<[reent]>;
 
 	void __env_unlock(<[reent]>)
-       struct _reent *<[reent]>;
+	struct _reent *<[reent]>;
 
 DESCRIPTION
-The <<setenv>> family of routines call these functions when they need
-to modify the environ variable.  The version of these routines supplied
-in the library does not do anything.  If multiple threads of execution
-can call <<setenv>>, or if <<setenv>> can be called reentrantly, then
-you need to define your own versions of these functions in order to
-safely lock the memory pool during a call.  If you do not, the memory
-pool may become corrupted.
+The <<setenv>> family of routines call these functions when they need to
+modify the environ variable.  The version of these routines supplied in the
+library use the lock API defined in sys/lock.h.  If multiple threads of
+execution can call <<setenv>>, or if <<setenv>> can be called reentrantly,
+then you need to define your own versions of these functions in order to
+safely lock the memory pool during a call.  If you do not, the memory pool
+may become corrupted.
 
 A call to <<setenv>> may call <<__env_lock>> recursively; that is,
 the sequence of calls may go <<__env_lock>>, <<__env_lock>>,
@@ -36,16 +36,26 @@ that it already holds.
 */
 
 #include "envlock.h"
+#include <sys/lock.h>
 
+#ifndef __SINGLE_THREAD__
+__LOCK_INIT_RECURSIVE(static, __env_lock_object);
+#endif
 
 void
 __env_lock (ptr)
      struct _reent *ptr;
 {
+#ifndef __SINGLE_THREAD__
+  __lock_acquire_recursive (__env_lock_object);
+#endif
 }
 
 void
 __env_unlock (ptr)
      struct _reent *ptr;
 {
+#ifndef __SINGLE_THREAD__
+  __lock_release_recursive (__env_lock_object);
+#endif
 }