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| author | Michael Jeanson <mjeanson@efficios.com> | 2024-08-01 10:35:34 -0400 |
|---|---|---|
| committer | Michael Jeanson <mjeanson@efficios.com> | 2025-01-10 20:20:17 +0000 |
| commit | 494d65129ed5ae1154b75cc189bbdde5e9ecf1df (patch) | |
| tree | 0025adfdd5e774e0a9a5467b31996e54daa97e2d /sysdeps/unix/sysv | |
| parent | be440f6c38ec2cdfd05439d2d90f140da34b8ce6 (diff) | |
| download | glibc-494d65129ed5ae1154b75cc189bbdde5e9ecf1df.zip glibc-494d65129ed5ae1154b75cc189bbdde5e9ecf1df.tar.gz glibc-494d65129ed5ae1154b75cc189bbdde5e9ecf1df.tar.bz2 | |
nptl: Introduce <rseq-access.h> for RSEQ_* accessors
In preparation to move the rseq area to the 'extra TLS' block, we need
accessors based on the thread pointer and the rseq offset. The ONCE
variant of the accessors ensures single-copy atomicity for loads and
stores which is required for all fields once the registration is active.
A separate header is required to allow including <atomic.h> which
results in an include loop when added to <tcb-access.h>.
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reviewed-by: Florian Weimer <fweimer@redhat.com>
Diffstat (limited to 'sysdeps/unix/sysv')
| -rw-r--r-- | sysdeps/unix/sysv/linux/rseq-internal.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/rseq-internal.h b/sysdeps/unix/sysv/linux/rseq-internal.h index 3993431..00be15c 100644 --- a/sysdeps/unix/sysv/linux/rseq-internal.h +++ b/sysdeps/unix/sysv/linux/rseq-internal.h @@ -25,6 +25,7 @@ #include <stdio.h> #include <sys/rseq.h> #include <ldsodefs.h> +#include <thread_pointer.h> /* Minimum size of the rseq area allocation required by the syscall. The actually used rseq feature size may be less (20 bytes initially). */ @@ -59,6 +60,13 @@ extern ptrdiff_t _rseq_offset attribute_hidden; rtld_hidden_proto (__rseq_size) rtld_hidden_proto (__rseq_offset) +/* Returns a pointer to the current thread rseq area. */ +static inline struct rseq_area * +RSEQ_SELF (void) +{ + return (struct rseq_area *) ((char *) __thread_pointer () + __rseq_offset); +} + #ifdef RSEQ_SIG static inline bool rseq_register_current_thread (struct pthread *self, bool do_rseq) |