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view src/os/unix/ngx_thread.h @ 8078:5244d3b165ff

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SSL: single allocation in session cache on 32-bit platforms. Given the present typical SSL session sizes, on 32-bit platforms it is now beneficial to store all data in a single allocation, since rbtree node + session id + ASN1 representation of a session takes 256 bytes of shared memory (36 + 32 + 150 = about 218 bytes plus SNI server name). Storing all data in a single allocation is beneficial for SNI names up to about 40 characters long and makes it possible to store about 4000 sessions in one megabyte (instead of about 3000 sessions now). This also slightly simplifies the code.
author Maxim Dounin <mdounin@mdounin.ru>
date Wed, 12 Oct 2022 20:14:40 +0300
parents d230c797b168
children
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_THREAD_H_INCLUDED_
#define _NGX_THREAD_H_INCLUDED_


#include <ngx_config.h>
#include <ngx_core.h>

#if (NGX_THREADS)

#include <pthread.h>


typedef pthread_mutex_t  ngx_thread_mutex_t;

ngx_int_t ngx_thread_mutex_create(ngx_thread_mutex_t *mtx, ngx_log_t *log);
ngx_int_t ngx_thread_mutex_destroy(ngx_thread_mutex_t *mtx, ngx_log_t *log);
ngx_int_t ngx_thread_mutex_lock(ngx_thread_mutex_t *mtx, ngx_log_t *log);
ngx_int_t ngx_thread_mutex_unlock(ngx_thread_mutex_t *mtx, ngx_log_t *log);


typedef pthread_cond_t  ngx_thread_cond_t;

ngx_int_t ngx_thread_cond_create(ngx_thread_cond_t *cond, ngx_log_t *log);
ngx_int_t ngx_thread_cond_destroy(ngx_thread_cond_t *cond, ngx_log_t *log);
ngx_int_t ngx_thread_cond_signal(ngx_thread_cond_t *cond, ngx_log_t *log);
ngx_int_t ngx_thread_cond_wait(ngx_thread_cond_t *cond, ngx_thread_mutex_t *mtx,
    ngx_log_t *log);


#if (NGX_LINUX)

typedef pid_t      ngx_tid_t;
#define NGX_TID_T_FMT         "%P"

#elif (NGX_FREEBSD)

typedef uint32_t   ngx_tid_t;
#define NGX_TID_T_FMT         "%uD"

#elif (NGX_DARWIN)

typedef uint64_t   ngx_tid_t;
#define NGX_TID_T_FMT         "%uL"

#else

typedef uint64_t   ngx_tid_t;
#define NGX_TID_T_FMT         "%uL"

#endif

ngx_tid_t ngx_thread_tid(void);

#define ngx_log_tid           ngx_thread_tid()

#else

#define ngx_log_tid           0
#define NGX_TID_T_FMT         "%d"

#endif


#endif /* _NGX_THREAD_H_INCLUDED_ */