Hi Yann,
looks good to me and nobody complained, so I pushed both patches.
best regards
Waldemar
Yann Sionneau wrote,
> For instance with buildroot config sipeed_maix_bit_defconfig the
> pre-processor generates
>
> if (1)
> r = ({ long _sys_result; { register long int _a7 __asm__ ("a7"); register
> long _a3 __asm__ ("a3"); long _a3tmp; register long _a2 __asm__ ("a2"); long
> _a2tmp; register long _a1 __asm__ ("a1"); long _a1tmp; long _a0tmp; register
> long _a0 __asm__ ("a0"); _a0tmp = (long) (clock_id); _a0 = _a0tmp; _a1tmp =
> (long) (flags); _a1 = _a1tmp; _a2tmp = (long) (req); _a2 = _a2tmp; _a3tmp =
> (long) (rem); _a3 = _a3tmp; _a7 = (115); __asm__ volatile ( "scall\n\t" :
> "=r" (_a0) : "r"(_a7) , "r" (_a0), "r" (_a1), "r" (_a2), "r" (_a3) :
> "memory"); _sys_result = _a0; } _sys_result; });
> else
> {
> int oldstate = LIBC_CANCEL_ASYNC ();
>
> r = ({ long _sys_result; { register long int _a7 __asm__ ("a7");
> register long _a3 __asm__ ("a3"); long _a3tmp; register long _a2 __asm__
> ("a2"); long _a2tmp; register long _a1 __asm__ ("a1"); long _a1tmp; long
> _a0tmp; register long _a0 __asm__ ("a0"); _a0tmp = (long) (clock_id); _a0 =
> _a0tmp; _a1tmp = (long) (flags); _a1 = _a1tmp; _a2tmp = (long) (req); _a2 =
> _a2tmp; _a3tmp = (long) (rem); _a3 = _a3tmp; _a7 = (115); __asm__ volatile (
> "scall\n\t" : "=r" (_a0) : "r"(_a7) , "r" (_a0), "r" (_a1), "r" (_a2), "r"
> (_a3) : "memory"); _sys_result = _a0; } _sys_result; })
> ;
>
> LIBC_CANCEL_RESET (oldstate);
> }
>
> And also the compiler issues these warnings:
>
> librt/clock_nanosleep.c: In function 'clock_nanosleep':
> librt/clock_nanosleep.c:43:22: warning: implicit declaration of function
> 'LIBC_CANCEL_ASYNC'; did you mean 'LIBC_CANCEL_HANDLED'?
> [-Wimplicit-function-declaration]
> 43 | int oldstate = LIBC_CANCEL_ASYNC ();
> | ^~~~~~~~~~~~~~~~~
> | LIBC_CANCEL_HANDLED
> librt/clock_nanosleep.c:48:7: warning: implicit declaration of function
> 'LIBC_CANCEL_RESET'; did you mean 'LIBC_CANCEL_HANDLED'?
> [-Wimplicit-function-declaration]
> 48 | LIBC_CANCEL_RESET (oldstate);
> | ^~~~~~~~~~~~~~~~~
> | LIBC_CANCEL_HANDLED
>
> So if the compiler is a bit picky and does not optimize the if (1) {} else {}
> it can fail to link with undefined symbols.
> This patch fixes this issue: no more warning.
>
> Btw, that's the solution that is already used in the following cancellation
> point files:
> * libc/sysdeps/linux/common/__syscall_fcntl.c
> * libc/sysdeps/linux/common/__syscall_fcntl64.c
> * libc/sysdeps/linux/common/ioctl.c
> * libc/sysdeps/linux/common/openat.c
> * libc/sysdeps/linux/common/open.c
>
> Signed-off-by: Yann Sionneau <y...@sionneau.net>
> ---
> librt/clock_nanosleep.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/librt/clock_nanosleep.c b/librt/clock_nanosleep.c
> index 4cf1e06b4..85db72fb3 100644
> --- a/librt/clock_nanosleep.c
> +++ b/librt/clock_nanosleep.c
> @@ -40,12 +40,14 @@ clock_nanosleep (clockid_t clock_id, int flags, const
> struct timespec *req,
> r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req,
> rem);
> else
> {
> +#ifdef __NEW_THREADS
> int oldstate = LIBC_CANCEL_ASYNC ();
>
> r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req,
> rem);
>
> LIBC_CANCEL_RESET (oldstate);
> +#endif
> }
>
> return (INTERNAL_SYSCALL_ERROR_P (r, err)
> --
> 2.34.1
>
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