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/* Copyright libuv project contributors. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef UV_WIN_FS_FD_HASH_INL_H_
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#define UV_WIN_FS_FD_HASH_INL_H_
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#include "uv.h"
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#include "internal.h"
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/* Files are only inserted in uv__fd_hash when the UV_FS_O_FILEMAP flag is
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* specified. Thus, when uv__fd_hash_get returns true, the file mapping in the
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* info structure should be used for read/write operations.
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*
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* If the file is empty, the mapping field will be set to
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* INVALID_HANDLE_VALUE. This is not an issue since the file mapping needs to
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* be created anyway when the file size changes.
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*
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* Since file descriptors are sequential integers, the modulo operator is used
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* as hashing function. For each bucket, a single linked list of arrays is
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* kept to minimize allocations. A statically allocated memory buffer is kept
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* for the first array in each bucket. */
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#define UV__FD_HASH_SIZE 256
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#define UV__FD_HASH_GROUP_SIZE 16
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struct uv__fd_info_s {
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int flags;
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BOOLEAN is_directory;
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HANDLE mapping;
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LARGE_INTEGER size;
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LARGE_INTEGER current_pos;
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};
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struct uv__fd_hash_entry_s {
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uv_file fd;
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struct uv__fd_info_s info;
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};
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struct uv__fd_hash_entry_group_s {
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struct uv__fd_hash_entry_s entries[UV__FD_HASH_GROUP_SIZE];
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struct uv__fd_hash_entry_group_s* next;
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};
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struct uv__fd_hash_bucket_s {
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size_t size;
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struct uv__fd_hash_entry_group_s* data;
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};
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static uv_mutex_t uv__fd_hash_mutex;
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static struct uv__fd_hash_entry_group_s
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uv__fd_hash_entry_initial[UV__FD_HASH_SIZE * UV__FD_HASH_GROUP_SIZE];
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static struct uv__fd_hash_bucket_s uv__fd_hash[UV__FD_HASH_SIZE];
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INLINE static void uv__fd_hash_init(void) {
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size_t i;
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int err;
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err = uv_mutex_init(&uv__fd_hash_mutex);
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if (err) {
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uv_fatal_error(err, "uv_mutex_init");
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}
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for (i = 0; i < ARRAY_SIZE(uv__fd_hash); ++i) {
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uv__fd_hash[i].size = 0;
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uv__fd_hash[i].data =
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uv__fd_hash_entry_initial + i * UV__FD_HASH_GROUP_SIZE;
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}
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}
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#define FIND_COMMON_VARIABLES \
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unsigned i; \
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unsigned bucket = fd % ARRAY_SIZE(uv__fd_hash); \
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struct uv__fd_hash_entry_s* entry_ptr = NULL; \
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struct uv__fd_hash_entry_group_s* group_ptr; \
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struct uv__fd_hash_bucket_s* bucket_ptr = &uv__fd_hash[bucket];
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#define FIND_IN_GROUP_PTR(group_size) \
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do { \
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for (i = 0; i < group_size; ++i) { \
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if (group_ptr->entries[i].fd == fd) { \
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entry_ptr = &group_ptr->entries[i]; \
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break; \
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} \
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} \
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} while (0)
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#define FIND_IN_BUCKET_PTR() \
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do { \
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size_t first_group_size = bucket_ptr->size % UV__FD_HASH_GROUP_SIZE; \
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if (bucket_ptr->size != 0 && first_group_size == 0) \
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first_group_size = UV__FD_HASH_GROUP_SIZE; \
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group_ptr = bucket_ptr->data; \
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FIND_IN_GROUP_PTR(first_group_size); \
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for (group_ptr = group_ptr->next; \
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group_ptr != NULL && entry_ptr == NULL; \
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group_ptr = group_ptr->next) \
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FIND_IN_GROUP_PTR(UV__FD_HASH_GROUP_SIZE); \
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} while (0)
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INLINE static int uv__fd_hash_get(int fd, struct uv__fd_info_s* info) {
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FIND_COMMON_VARIABLES
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uv_mutex_lock(&uv__fd_hash_mutex);
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FIND_IN_BUCKET_PTR();
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if (entry_ptr != NULL) {
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*info = entry_ptr->info;
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}
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uv_mutex_unlock(&uv__fd_hash_mutex);
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return entry_ptr != NULL;
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}
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INLINE static void uv__fd_hash_add(int fd, struct uv__fd_info_s* info) {
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FIND_COMMON_VARIABLES
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uv_mutex_lock(&uv__fd_hash_mutex);
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FIND_IN_BUCKET_PTR();
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if (entry_ptr == NULL) {
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i = bucket_ptr->size % UV__FD_HASH_GROUP_SIZE;
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if (bucket_ptr->size != 0 && i == 0) {
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struct uv__fd_hash_entry_group_s* new_group_ptr =
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uv__malloc(sizeof(*new_group_ptr));
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if (new_group_ptr == NULL) {
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uv_fatal_error(ERROR_OUTOFMEMORY, "uv__malloc");
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}
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new_group_ptr->next = bucket_ptr->data;
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bucket_ptr->data = new_group_ptr;
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}
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bucket_ptr->size += 1;
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entry_ptr = &bucket_ptr->data->entries[i];
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entry_ptr->fd = fd;
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}
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entry_ptr->info = *info;
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uv_mutex_unlock(&uv__fd_hash_mutex);
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}
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INLINE static int uv__fd_hash_remove(int fd, struct uv__fd_info_s* info) {
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FIND_COMMON_VARIABLES
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uv_mutex_lock(&uv__fd_hash_mutex);
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FIND_IN_BUCKET_PTR();
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if (entry_ptr != NULL) {
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*info = entry_ptr->info;
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bucket_ptr->size -= 1;
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i = bucket_ptr->size % UV__FD_HASH_GROUP_SIZE;
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if (entry_ptr != &bucket_ptr->data->entries[i]) {
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*entry_ptr = bucket_ptr->data->entries[i];
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}
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if (bucket_ptr->size != 0 &&
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bucket_ptr->size % UV__FD_HASH_GROUP_SIZE == 0) {
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struct uv__fd_hash_entry_group_s* old_group_ptr = bucket_ptr->data;
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bucket_ptr->data = old_group_ptr->next;
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uv__free(old_group_ptr);
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}
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}
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uv_mutex_unlock(&uv__fd_hash_mutex);
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return entry_ptr != NULL;
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}
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#undef FIND_COMMON_VARIABLES
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#undef FIND_IN_GROUP_PTR
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#undef FIND_IN_BUCKET_PTR
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#endif /* UV_WIN_FS_FD_HASH_INL_H_ */
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