Merge pull request #107 from leekunpeng/master

Fix issue when creating large (> 4GB) shared memory areas on Windows
saprykin · Apr 19, 2024 · a102cf1 · a102cf1
2 parents 5c57d0a + fbc1f0b
commit a102cf1
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Showing 2 changed files with 6 additions and 3 deletions.
diff --git a/.gitignore b/.gitignore
@@ -1,2 +1,2 @@
 CMakeLists.txt.user
-.DS_Store
+.DS_Store
diff --git a/src/pshm-win.c b/src/pshm-win.c
@@ -36,6 +36,9 @@
 #define P_SHM_INVALID_HDL NULL
 #define P_SHM_SUFFIX "_p_shm_object"
 
+#define HIDWORD(l) ((DWORD)(((DWORDLONG)(l) >> 32) & 0xFFFFFFFF))
+#define LODWORD(l) ((DWORD)((DWORDLONG)(l)))
+
 typedef HANDLE pshm_hdl;
 
 struct PShm_ {
@@ -74,8 +77,8 @@ pp_shm_create_handle (PShm *shm,
  if (P_UNLIKELY ((shm->shm_hdl = CreateFileMappingA (INVALID_HANDLE_VALUE,
  NULL,
  protect,
- 0,
- (DWORD) shm->size,
+ HIDWORD(shm->size),
+ LODWORD(shm->size),
  shm->platform_key)) == NULL)) {
  p_error_set_error_p (error,
  (pint) p_error_get_last_ipc (),