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* ext/socket: Avoid unnecessary ppoll/select on Linux.

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Patch by Eric Wong.  [ruby-core:57950] [Bug #9039]



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44643 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2014-01-18 14:13:22 +00:00
parent e86a90420d
commit 971ef82267
5 changed files with 25 additions and 4 deletions
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16
ext/socket/rubysocket.h
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@ -386,4 +386,20 @@ NORETURN(void rsock_sys_fail_sockaddr(const char *, struct sockaddr *addr, sockl
NORETURN(void rsock_sys_fail_raddrinfo(const char *, VALUE rai));
NORETURN(void rsock_sys_fail_raddrinfo_or_sockaddr(const char *, VALUE addr, VALUE rai));
/*
* It is safe on Linux to attempt using a socket without waiting on it in
* all cases. For some syscalls (e.g. accept/accept4), blocking on the
* syscall instead of relying on select/poll allows the kernel to use
* "wake-one" behavior and avoid the thundering herd problem.
* This is likely safe on all other *nix-like systems, so this whitelist
* can be expanded by interested parties.
*/
#if defined(__linux__)
static inline int rsock_maybe_fd_writable(int fd) { return 1; }
static inline void rsock_maybe_wait_fd(int fd) { }
#else /* some systems (mswin/mingw) need these. ref: r36946 */
# define rsock_maybe_fd_writable(fd) rb_thread_fd_writable((fd))
# define rsock_maybe_wait_fd(fd) rb_thread_wait_fd((fd))
#endif
#endif