view src/os/win32/ngx_shmem.c @ 5860:c9787372f16d

Limit conn: use complex value in limit_conn_zone (ticket #121). One intentional side effect of this change is that key is allowed only in the first position. Previously, it was possible to specify the key variable at any position, but that was never documented, and is contrary to nginx configuration practice for positional parameters.
author Valentin Bartenev <vbart@nginx.com>
date Wed, 24 Sep 2014 21:55:19 +0400
parents b3d4e9c66e24
children af7eba90645d
line wrap: on
line source


/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


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


ngx_int_t
ngx_shm_alloc(ngx_shm_t *shm)
{
    u_char    *name;
    uint64_t   size;

    name = ngx_alloc(shm->name.len + 2 + NGX_INT32_LEN, shm->log);
    if (name == NULL) {
        return NGX_ERROR;
    }

    (void) ngx_sprintf(name, "%V_%s%Z", &shm->name, ngx_unique);

    ngx_set_errno(0);

    size = shm->size;

    shm->handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE,
                                    (u_long) (size >> 32),
                                    (u_long) (size & 0xffffffff),
                                    (char *) name);

    if (shm->handle == NULL) {
        ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
                      "CreateFileMapping(%uz, %s) failed",
                      shm->size, name);
        ngx_free(name);

        return NGX_ERROR;
    }

    ngx_free(name);

    if (ngx_errno == ERROR_ALREADY_EXISTS) {
        shm->exists = 1;
    }

    shm->addr = MapViewOfFile(shm->handle, FILE_MAP_WRITE, 0, 0, 0);

    if (shm->addr != NULL) {
        return NGX_OK;
    }

    ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
                  "MapViewOfFile(%uz) of file mapping \"%V\" failed",
                  shm->size, &shm->name);

    if (CloseHandle(shm->handle) == 0) {
        ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
                      "CloseHandle() of file mapping \"%V\" failed",
                      &shm->name);
    }

    return NGX_ERROR;
}


void
ngx_shm_free(ngx_shm_t *shm)
{
    if (UnmapViewOfFile(shm->addr) == 0) {
        ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
                      "UnmapViewOfFile(%p) of file mapping \"%V\" failed",
                      shm->addr, &shm->name);
    }

    if (CloseHandle(shm->handle) == 0) {
        ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
                      "CloseHandle() of file mapping \"%V\" failed",
                      &shm->name);
    }
}