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160
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9
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10
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11 #if (NGX_HAVE_ATOMIC_OPS)
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12
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13
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14 ngx_int_t
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15 ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name, ngx_log_t *log)
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16 {
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17 mtx->lock = addr;
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18
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19 return NGX_OK;
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20 }
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21
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22 #else
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23
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24
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25 ngx_int_t
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26 ngx_shmtx_create(ngx_shmtx_t *mtx, void *addr, u_char *name, ngx_log_t *log)
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27 {
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28 if (mtx->name) {
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29
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30 if (ngx_strcmp(name, mtx->name) == 0) {
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31 mtx->name = name;
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32 mtx->log = log;
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33
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34 return NGX_OK;
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35 }
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36
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37 ngx_shmtx_destory(mtx);
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38 }
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39
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40 mtx->fd = ngx_open_file(name, NGX_FILE_RDWR, NGX_FILE_CREATE_OR_OPEN);
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41
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42 if (mtx->fd == NGX_INVALID_FILE) {
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43 ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
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44 ngx_open_file_n " \"%s\" failed", name);
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45 return NGX_ERROR;
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46 }
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47
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48 if (ngx_delete_file(name) == NGX_FILE_ERROR) {
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49 ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
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50 ngx_delete_file_n " \"%s\" failed", name);
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51 }
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52
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53 mtx->name = name;
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54 mtx->log = log;
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55
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56 return NGX_OK;
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57 }
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58
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59
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60 void
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61 ngx_shmtx_destory(ngx_shmtx_t *mtx)
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62 {
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63 if (ngx_close_file(mtx->fd) == NGX_FILE_ERROR) {
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64 ngx_log_error(NGX_LOG_ALERT, mtx->log, ngx_errno,
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65 ngx_close_file_n " \"%s\" failed", mtx->name);
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66 }
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67 }
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68
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69
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70 #endif
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