diff options
Diffstat (limited to 'app/nginx/src/os/win32/ngx_shmem.c')
| -rw-r--r-- | app/nginx/src/os/win32/ngx_shmem.c | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/app/nginx/src/os/win32/ngx_shmem.c b/app/nginx/src/os/win32/ngx_shmem.c deleted file mode 100644 index c3ed699..0000000 --- a/app/nginx/src/os/win32/ngx_shmem.c +++ /dev/null @@ -1,161 +0,0 @@ - -/* - * Copyright (C) Igor Sysoev - * Copyright (C) Nginx, Inc. - */ - - -#include <ngx_config.h> -#include <ngx_core.h> - - -/* - * Base addresses selected by system for shared memory mappings are likely - * to be different on Windows Vista and later versions due to address space - * layout randomization. This is however incompatible with storing absolute - * addresses within the shared memory. - * - * To make it possible to store absolute addresses we create mappings - * at the same address in all processes by starting mappings at predefined - * addresses. The addresses were selected somewhat randomly in order to - * minimize the probability that some other library doing something similar - * conflicts with us. The addresses are from the following typically free - * blocks: - * - * - 0x10000000 .. 0x70000000 (about 1.5 GB in total) on 32-bit platforms - * - 0x000000007fff0000 .. 0x000007f68e8b0000 (about 8 TB) on 64-bit platforms - * - * Additionally, we allow to change the mapping address once it was detected - * to be different from one originally used. This is needed to support - * reconfiguration. - */ - - -#ifdef _WIN64 -#define NGX_SHMEM_BASE 0x0000047047e00000 -#else -#define NGX_SHMEM_BASE 0x2efe0000 -#endif - - -ngx_uint_t ngx_allocation_granularity; - - -ngx_int_t -ngx_shm_alloc(ngx_shm_t *shm) -{ - u_char *name; - uint64_t size; - static u_char *base = (u_char *) NGX_SHMEM_BASE; - - 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 = MapViewOfFileEx(shm->handle, FILE_MAP_WRITE, 0, 0, 0, base); - - if (shm->addr != NULL) { - base += ngx_align(size, ngx_allocation_granularity); - return NGX_OK; - } - - ngx_log_debug3(NGX_LOG_DEBUG_CORE, shm->log, ngx_errno, - "MapViewOfFileEx(%uz, %p) of file mapping \"%V\" failed, " - "retry without a base address", - shm->size, base, &shm->name); - - /* - * Order of shared memory zones may be different in the master process - * and worker processes after reconfiguration. As a result, the above - * may fail due to a conflict with a previously created mapping remapped - * to a different address. Additionally, there may be a conflict with - * some other uses of the memory. In this case we retry without a base - * address to let the system assign the address itself. - */ - - 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; -} - - -ngx_int_t -ngx_shm_remap(ngx_shm_t *shm, u_char *addr) -{ - 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); - return NGX_ERROR; - } - - shm->addr = MapViewOfFileEx(shm->handle, FILE_MAP_WRITE, 0, 0, 0, addr); - - if (shm->addr != NULL) { - return NGX_OK; - } - - ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, - "MapViewOfFileEx(%uz, %p) of file mapping \"%V\" failed", - shm->size, addr, &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); - } -} |