comparison: src/buffer.c
src/buffer.c
- changeset 1539
- 2cbdb482d325
- parent 1520
- 03d703c3cfe9
- child 1542
- 197450c2b0b3
equal
deleted
inserted
replaced
| 1538:fd948e5af26e | 1539:2cbdb482d325 |
|---|---|
| 30 | 30 |
| 31 #include <stdio.h> | 31 #include <stdio.h> |
| 32 #include <string.h> | 32 #include <string.h> |
| 33 #include <errno.h> | 33 #include <errno.h> |
| 34 | 34 |
| 35 #ifdef _WIN32 | |
| 36 #include <Windows.h> | |
| 37 #include <sysinfoapi.h> | |
| 38 static unsigned long system_page_size(void) { | |
| 39 static unsigned long ps = 0; | |
| 40 if (ps == 0) { | |
| 41 SYSTEM_INFO sysinfo; | |
| 42 GetSystemInfo(&sysinfo); | |
| 43 ps = sysinfo.dwPageSize; | |
| 44 } | |
| 45 return ps; | |
| 46 } | |
| 47 #else | |
| 48 #include <unistd.h> | |
| 49 static unsigned long system_page_size(void) { | |
| 50 static unsigned long ps = 0; | |
| 51 if (ps == 0) { | |
| 52 long sc = sysconf(_SC_PAGESIZE); | |
| 53 if (sc < 0) { | |
| 54 // fallback for systems which do not report a value here | |
| 55 ps = 4096; // LCOV_EXCL_LINE | |
| 56 } else { | |
| 57 ps = (unsigned long) sc; | |
| 58 } | |
| 59 } | |
| 60 return ps; | |
| 61 } | |
| 62 #endif | |
| 63 | |
| 64 static int buffer_copy_on_write(CxBuffer* buffer) { | 35 static int buffer_copy_on_write(CxBuffer* buffer) { |
| 65 if (0 == (buffer->flags & CX_BUFFER_COPY_ON_WRITE)) return 0; | 36 if (0 == (buffer->flags & CX_BUFFER_COPY_ON_WRITE)) return 0; |
| 66 void *newspace = cxMalloc(buffer->allocator, buffer->capacity); | 37 void *newspace = cxMalloc(buffer->allocator, buffer->capacity); |
| 67 if (NULL == newspace) return -1; // LCOV_EXCL_LINE | 38 if (NULL == newspace) return -1; // LCOV_EXCL_LINE |
| 68 memcpy(newspace, buffer->space, buffer->size); | 39 memcpy(newspace, buffer->space, buffer->size); |
| 260 return -1; // LCOV_EXCL_LINE | 231 return -1; // LCOV_EXCL_LINE |
| 261 } | 232 } |
| 262 } | 233 } |
| 263 | 234 |
| 264 static size_t cx_buffer_calculate_minimum_capacity(size_t mincap) { | 235 static size_t cx_buffer_calculate_minimum_capacity(size_t mincap) { |
| 265 unsigned long pagesize = system_page_size(); | 236 unsigned long pagesize = cx_system_page_size(); |
| 266 // if page size is larger than 64 KB - for some reason - truncate to 64 KB | 237 // if page size is larger than 64 KB - for some reason - truncate to 64 KB |
| 267 if (pagesize > 65536) pagesize = 65536; | 238 if (pagesize > 65536) pagesize = 65536; |
| 268 if (mincap < pagesize) { | 239 if (mincap < pagesize) { |
| 269 // when smaller as one page, map to the next power of two | 240 // when smaller as one page, map to the next power of two |
| 270 mincap--; | 241 mincap--; |
