Mercurial > hg > nginx
view src/core/ngx_config.h @ 8045:aa28c802409f
Resolver: make TCP write timer event cancelable.
Similar to 70e65bf8dfd7, the change is made to ensure that the ability to
cancel resolver tasks is fully controlled by the caller. As mentioned in the
referenced commit, it is safe to make this timer cancelable because resolve
tasks can have their own timeouts that are not cancelable.
The scenario where this may become a problem is a periodic background resolve
task (not tied to a specific request or a client connection), which receives a
response with short TTL, large enough to warrant fallback to a TCP query.
With each event loop wakeup, we either have a previously set write timer
instance or schedule a new one. The non-cancelable write timer can delay or
block graceful shutdown of a worker even if the ngx_resolver_ctx_t->cancelable
flag is set by the API user, and there are no other tasks or connections.
We use the resolver API in this way to maintain the list of upstream server
addresses specified with the 'resolve' parameter, and there could be third-party
modules implementing similar logic.
| author | Aleksei Bavshin <a.bavshin@f5.com> |
|---|---|
| date | Wed, 01 Jun 2022 20:17:23 -0700 |
| parents | d200a0fd00b7 |
| children |
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/* * Copyright (C) Igor Sysoev * Copyright (C) Nginx, Inc. */ #ifndef _NGX_CONFIG_H_INCLUDED_ #define _NGX_CONFIG_H_INCLUDED_ #include <ngx_auto_headers.h> #if defined __DragonFly__ && !defined __FreeBSD__ #define __FreeBSD__ 4 #define __FreeBSD_version 480101 #endif #if (NGX_FREEBSD) #include <ngx_freebsd_config.h> #elif (NGX_LINUX) #include <ngx_linux_config.h> #elif (NGX_SOLARIS) #include <ngx_solaris_config.h> #elif (NGX_DARWIN) #include <ngx_darwin_config.h> #elif (NGX_WIN32) #include <ngx_win32_config.h> #else /* POSIX */ #include <ngx_posix_config.h> #endif #ifndef NGX_HAVE_SO_SNDLOWAT #define NGX_HAVE_SO_SNDLOWAT 1 #endif #if !(NGX_WIN32) #define ngx_signal_helper(n) SIG##n #define ngx_signal_value(n) ngx_signal_helper(n) #define ngx_random random /* TODO: #ifndef */ #define NGX_SHUTDOWN_SIGNAL QUIT #define NGX_TERMINATE_SIGNAL TERM #define NGX_NOACCEPT_SIGNAL WINCH #define NGX_RECONFIGURE_SIGNAL HUP #if (NGX_LINUXTHREADS) #define NGX_REOPEN_SIGNAL INFO #define NGX_CHANGEBIN_SIGNAL XCPU #else #define NGX_REOPEN_SIGNAL USR1 #define NGX_CHANGEBIN_SIGNAL USR2 #endif #define ngx_cdecl #define ngx_libc_cdecl #endif typedef intptr_t ngx_int_t; typedef uintptr_t ngx_uint_t; typedef intptr_t ngx_flag_t; #define NGX_INT32_LEN (sizeof("-2147483648") - 1) #define NGX_INT64_LEN (sizeof("-9223372036854775808") - 1) #if (NGX_PTR_SIZE == 4) #define NGX_INT_T_LEN NGX_INT32_LEN #define NGX_MAX_INT_T_VALUE 2147483647 #else #define NGX_INT_T_LEN NGX_INT64_LEN #define NGX_MAX_INT_T_VALUE 9223372036854775807 #endif #ifndef NGX_ALIGNMENT #define NGX_ALIGNMENT sizeof(unsigned long) /* platform word */ #endif #define ngx_align(d, a) (((d) + (a - 1)) & ~(a - 1)) #define ngx_align_ptr(p, a) \ (u_char *) (((uintptr_t) (p) + ((uintptr_t) a - 1)) & ~((uintptr_t) a - 1)) #define ngx_abort abort /* TODO: platform specific: array[NGX_INVALID_ARRAY_INDEX] must cause SIGSEGV */ #define NGX_INVALID_ARRAY_INDEX 0x80000000 /* TODO: auto_conf: ngx_inline inline __inline __inline__ */ #ifndef ngx_inline #define ngx_inline inline #endif #ifndef INADDR_NONE /* Solaris */ #define INADDR_NONE ((unsigned int) -1) #endif #ifdef MAXHOSTNAMELEN #define NGX_MAXHOSTNAMELEN MAXHOSTNAMELEN #else #define NGX_MAXHOSTNAMELEN 256 #endif #define NGX_MAX_UINT32_VALUE (uint32_t) 0xffffffff #define NGX_MAX_INT32_VALUE (uint32_t) 0x7fffffff #if (NGX_COMPAT) #define NGX_COMPAT_BEGIN(slots) uint64_t spare[slots]; #define NGX_COMPAT_END #else #define NGX_COMPAT_BEGIN(slots) #define NGX_COMPAT_END #endif #endif /* _NGX_CONFIG_H_INCLUDED_ */