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annotate src/os/win32/ngx_shmem.c @ 2903:beb0707ed8ab

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allow shared memory segments more than 4G
author Igor Sysoev <igor@sysoev.ru>
date Sat, 30 May 2009 17:06:38 +0000
parents d52cf82d0d77
children 474a9daf8c80
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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 ngx_int_t
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12 ngx_shm_alloc(ngx_shm_t *shm)
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13 {
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14 u_char *name;
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15 uint64_t size;
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16
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17 name = ngx_alloc(shm->name.len + 2 + sizeof(NGX_INT32_LEN), shm->log);
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18 if (name == NULL) {
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19 return NGX_ERROR;
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20 }
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21
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22 ngx_sprintf(name, "%V_%s%Z", &shm->name, ngx_unique);
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23
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24 ngx_set_errno(0);
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25
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26 size = shm->size;
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27
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28 shm->handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE,
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29 (u_long) (size >> 32),
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30 (u_long) (size & 0xffffffff),
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31 (char *) name);
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32
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33 if (shm->handle == NULL) {
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34 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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35 "CreateFileMapping(%uz, %s) failed",
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36 shm->size, shm->name.data);
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37 goto failed;
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38 }
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39
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40 if (ngx_errno == ERROR_ALREADY_EXISTS) {
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41 shm->exists = 1;
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42 }
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43
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44 shm->addr = MapViewOfFile(shm->handle, FILE_MAP_WRITE, 0, 0, 0);
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45
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46 if (shm->addr != NULL) {
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47 return NGX_OK;
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48 }
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49
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50 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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51 "MapViewOfFile(%uz) failed", shm->size);
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52
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53 if (CloseHandle(shm->handle) == 0) {
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54 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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55 "CloseHandle() failed");
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56 }
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57
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58 failed:
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59
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60 ngx_free(name);
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61
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62 return NGX_ERROR;
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63 }
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66 void
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67 ngx_shm_free(ngx_shm_t *shm)
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68 {
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69 if (UnmapViewOfFile(shm->addr) == 0) {
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70 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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71 "UnmapViewOfFile(%p) failed", shm->addr);
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72 }
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73
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74 if (CloseHandle(shm->handle) == 0) {
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75 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno,
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76 "CloseHandle() failed");
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77 }
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78 }