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Linux: Explicitly disable cancellation checking in the dynamic loader

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Historically, SINGLE_THREAD_P is defined to 1 in the dynamic loader.
This has the side effect of disabling cancellation points.  In order
to enable future use of SINGLE_THREAD_P for single-thread
optimizations in the dynamic loader (which becomes important once
more code is moved from libpthread), introduce a new
NO_SYSCALL_CANCEL_CHECKING macro which is always 1 for IS_IN (rtld),
indepdently of the actual SINGLE_THREAD_P value.

Tested-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer 2021-05-10 10:31:41 +02:00
parent 321789f61a
commit 1c75f89613
1 changed files with 9 additions and 2 deletions
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11
sysdeps/unix/sysdep.h
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@ -88,10 +88,17 @@
#define INLINE_SYSCALL_CALL(...) \
__INLINE_SYSCALL_DISP (__INLINE_SYSCALL, __VA_ARGS__)
#if IS_IN (rtld)
/* All cancellation points are compiled out in the dynamic loader. */
# define NO_SYSCALL_CANCEL_CHECKING 1
#else
# define NO_SYSCALL_CANCEL_CHECKING SINGLE_THREAD_P
#endif
#define SYSCALL_CANCEL(...) \
({ \
long int sc_ret; \
if (SINGLE_THREAD_P) \
if (NO_SYSCALL_CANCEL_CHECKING) \
sc_ret = INLINE_SYSCALL_CALL (__VA_ARGS__); \
else \
{ \
@ -107,7 +114,7 @@
#define INTERNAL_SYSCALL_CANCEL(...) \
({ \
long int sc_ret; \
if (SINGLE_THREAD_P) \
if (NO_SYSCALL_CANCEL_CHECKING) \
sc_ret = INTERNAL_SYSCALL_CALL (__VA_ARGS__); \
else \
{ \