diff options
Diffstat (limited to 'src/os_win.c')
| -rw-r--r-- | src/os_win.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/src/os_win.c b/src/os_win.c index 842a4ad7c..f770f1386 100644 --- a/src/os_win.c +++ b/src/os_win.c @@ -414,10 +414,9 @@ const sqlite3_mem_methods *sqlite3MemGetWin32(void); ** can manually set this value to 1 to emulate Win98 behavior. */ #ifdef SQLITE_TEST -int sqlite3_os_type = 0; -#elif !SQLITE_OS_WINCE && !SQLITE_OS_WINRT && \ - defined(SQLITE_WIN32_HAS_ANSI) && defined(SQLITE_WIN32_HAS_WIDE) -static int sqlite3_os_type = 0; +LONG volatile sqlite3_os_type = 0; +#else +static LONG volatile sqlite3_os_type = 0; #endif #ifndef SYSCALL @@ -1048,6 +1047,11 @@ static struct win_syscall { #define osCreateFileMappingFromApp ((HANDLE(WINAPI*)(HANDLE, \ LPSECURITY_ATTRIBUTES,ULONG,ULONG64,LPCWSTR))aSyscall[75].pCurrent) + { "InterlockedCompareExchange", (SYSCALL)InterlockedCompareExchange, 0 }, + +#define osInterlockedCompareExchange ((LONG(WINAPI*)(LONG volatile*, \ + LONG,LONG))aSyscall[76].pCurrent) + }; /* End of the overrideable system calls */ /* @@ -1298,7 +1302,7 @@ void sqlite3_win32_sleep(DWORD milliseconds){ #elif !defined(SQLITE_WIN32_HAS_WIDE) # define osIsNT() (0) #else -# define osIsNT() (sqlite3_win32_is_nt()) +# define osIsNT() ((sqlite3_os_type==2) || sqlite3_win32_is_nt()) #endif /* @@ -1306,7 +1310,7 @@ void sqlite3_win32_sleep(DWORD milliseconds){ ** based on the NT kernel. */ int sqlite3_win32_is_nt(void){ - if( sqlite3_os_type==0 ){ + if( osInterlockedCompareExchange(&sqlite3_os_type, 0, 0)==0 ){ #if defined(NTDDI_VERSION) && NTDDI_VERSION >= NTDDI_WIN8 OSVERSIONINFOW sInfo; sInfo.dwOSVersionInfoSize = sizeof(sInfo); @@ -1316,9 +1320,10 @@ int sqlite3_win32_is_nt(void){ sInfo.dwOSVersionInfoSize = sizeof(sInfo); osGetVersionExA(&sInfo); #endif - sqlite3_os_type = (sInfo.dwPlatformId == VER_PLATFORM_WIN32_NT) ? 2 : 1; + osInterlockedCompareExchange(&sqlite3_os_type, + (sInfo.dwPlatformId == VER_PLATFORM_WIN32_NT) ? 2 : 1, 0); } - return (sqlite3_os_type == 2); + return osInterlockedCompareExchange(&sqlite3_os_type, 2, 2)==2; } #ifdef SQLITE_WIN32_MALLOC @@ -5475,7 +5480,7 @@ int sqlite3_os_init(void){ /* Double-check that the aSyscall[] array has been constructed ** correctly. See ticket [bb3a86e890c8e96ab] */ - assert( ArraySize(aSyscall)==76 ); + assert( ArraySize(aSyscall)==77 ); /* get memory map allocation granularity */ memset(&winSysInfo, 0, sizeof(SYSTEM_INFO)); |