diff options
Diffstat (limited to 'newlib/libc/stdlib/envlock.c')
| -rw-r--r-- | newlib/libc/stdlib/envlock.c | 32 |
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 } |