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* sysdeps/unix/sysv/linux/kernel-features.h: Define

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__ASSUME_COMPLETE_READV_WRITEV.
	* sysdeps/unix/sysv/linux/readv.c: No need for userlevel fallback
	with modern kernels.
	* sysdeps/unix/sysv/linux/writev.c: Likewise.

	* sysdeps/posix/readv.c: Since read is a cancellation point we have
	to free a possible malloced buffer in case of cancellation.
	* sysdeps/posix/writev.c: Likewise for write.

c2009-04-01  Ulrich Drepper  <drepper@redhat.com>
This commit is contained in:
Ulrich Drepper
2009-04-03 17:23:13 +00:00
parent a065c0076a
commit 2dbe6afe7c
6 changed files with 79 additions and 53 deletions
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7
sysdeps/unix/sysv/linux/kernel-features.h
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@ -462,6 +462,13 @@
# define __ASSUME_SET_ROBUST_LIST 1
#endif
/* Pessimistically assume that 2.6.18 introduced real handling of
large numbers of requests to readv and writev and that we don't
need a fallback. It likely worked for much longer. */
#if __LINUX_KERNEL_VERSION >= 0x020612
# define __ASSUME_COMPLETE_READV_WRITEV 1
#endif
/* Support for PI futexes was added in 2.6.18. */
#if __LINUX_KERNEL_VERSION >= 0x020612
# define __ASSUME_FUTEX_LOCK_PI 1