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author | Florian Weimer <fweimer@redhat.com> | 2021-07-07 08:40:41 +0200 |
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committer | Florian Weimer <fweimer@redhat.com> | 2021-07-07 08:41:14 +0200 |
commit | 1f9c804fbd699104adefbce9e56d2c8aa711b6b9 (patch) | |
tree | 40ebde2c85824208b941e95c88d3b383d5f69bc6 /sysdeps | |
parent | 83e55c982ffcf42185254cff5ac16377672ae32e (diff) | |
download | glibc-1f9c804fbd699104adefbce9e56d2c8aa711b6b9.zip glibc-1f9c804fbd699104adefbce9e56d2c8aa711b6b9.tar.gz glibc-1f9c804fbd699104adefbce9e56d2c8aa711b6b9.tar.bz2 |
nptl: Use internal low-level lock type for !IS_IN (libc)
This avoids an ABI hazard (types changing between different modules
of glibc) without introducing linknamespace issues. In particular,
NSS modules now call __lll_lock_wait_private@@GLIBC_PRIVATE to wait
on internal locks (the unlock path is inlined and performs a direct
system call).
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'sysdeps')
-rw-r--r-- | sysdeps/nptl/libc-lockP.h | 51 |
1 files changed, 5 insertions, 46 deletions
diff --git a/sysdeps/nptl/libc-lockP.h b/sysdeps/nptl/libc-lockP.h index ef88a3e..b66c938 100644 --- a/sysdeps/nptl/libc-lockP.h +++ b/sysdeps/nptl/libc-lockP.h @@ -33,18 +33,8 @@ #include <lowlevellock.h> #include <tls.h> -#if IS_IN (libpthread) -/* This gets us the declarations of the __pthread_* internal names, - and hidden_proto for them. */ -# include <pthreadP.h> -#endif - /* Mutex type. */ -#if !IS_IN (libc) && !IS_IN (libpthread) -typedef pthread_mutex_t __libc_lock_t; -#else typedef int __libc_lock_t; -#endif typedef struct { pthread_mutex_t mutex; } __rtld_lock_recursive_t; typedef pthread_rwlock_t __libc_rwlock_t; @@ -108,56 +98,25 @@ _Static_assert (LLL_LOCK_INITIALIZER == 0, "LLL_LOCK_INITIALIZER != 0"); /* Initialize the named lock variable, leaving it in a consistent, unlocked state. */ -#if IS_IN (libc) || IS_IN (libpthread) -# define __libc_lock_init(NAME) \ - ((void) ((NAME) = LLL_LOCK_INITIALIZER)) -#else -# define __libc_lock_init(NAME) __pthread_mutex_init (&(NAME)) -#endif +#define __libc_lock_init(NAME) ((void) ((NAME) = LLL_LOCK_INITIALIZER)) #define __libc_rwlock_init(NAME) __pthread_rwlock_init (&(NAME), NULL) /* Finalize the named lock variable, which must be locked. It cannot be used again until __libc_lock_init is called again on it. This must be called on a lock variable before the containing storage is reused. */ -#if IS_IN (libc) || IS_IN (libpthread) -# define __libc_lock_fini(NAME) ((void) 0) -#else -# define __libc_lock_fini(NAME) __pthread_mutex_destroy (&(NAME)) -#endif +#define __libc_lock_fini(NAME) ((void) 0) #define __libc_rwlock_fini(NAME) ((void) 0) /* Lock the named lock variable. */ -#if IS_IN (libc) || IS_IN (libpthread) -# ifndef __libc_lock_lock -# define __libc_lock_lock(NAME) \ - ({ lll_lock (NAME, LLL_PRIVATE); 0; }) -# endif -#else -# undef __libc_lock_lock -# define __libc_lock_lock(NAME) __pthread_mutex_lock (&(NAME)) -#endif +#define __libc_lock_lock(NAME) ({ lll_lock (NAME, LLL_PRIVATE); 0; }) #define __libc_rwlock_rdlock(NAME) __pthread_rwlock_rdlock (&(NAME)) #define __libc_rwlock_wrlock(NAME) __pthread_rwlock_wrlock (&(NAME)) /* Try to lock the named lock variable. */ -#if IS_IN (libc) || IS_IN (libpthread) -# ifndef __libc_lock_trylock -# define __libc_lock_trylock(NAME) \ - lll_trylock (NAME) -# endif -#else -# undef __libc_lock_trylock -# define __libc_lock_trylock(NAME) \ - __libc_maybe_call (__pthread_mutex_trylock, (&(NAME)), 0) -#endif +#define __libc_lock_trylock(NAME) lll_trylock (NAME) /* Unlock the named lock variable. */ -#if IS_IN (libc) || IS_IN (libpthread) -# define __libc_lock_unlock(NAME) \ - lll_unlock (NAME, LLL_PRIVATE) -#else -# define __libc_lock_unlock(NAME) __pthread_mutex_unlock (&(NAME)) -#endif +#define __libc_lock_unlock(NAME) lll_unlock (NAME, LLL_PRIVATE) #define __libc_rwlock_unlock(NAME) __pthread_rwlock_unlock (&(NAME)) #if IS_IN (rtld) |