mdbx-windows: handling EXCEPTION_POSSIBLE_DEADLOCK.

Change-Id: If42c7833e9c4e02fef25634e69c0bd2e926686c1

.github/actions/spelling/expect.txt

@@ -447,6 +447,7 @@ EWOULDBLOCK
 Exa
 exactkey
 exactp
+excpt
 exe
 exename
 exherbo

ChangeLog.md

@@ -58,6 +58,7 @@ Fixes:
  - Fixed large pages checking (for compatibility and to avoid false-positive errors from `mdbx_chk`).
  - Added workaround for Wine (https://github.com/miranda-ng/miranda-ng/issues/1209).
  - Fixed `ERROR_NOT_SUPPORTED` while opening DB by UNC pathnames (https://github.com/miranda-ng/miranda-ng/issues/2627).
+ - Added handling `EXCEPTION_POSSIBLE_DEADLOCK` condition for Windows.
 
 
 ## v0.9.1 2020-09-30

src/lck-windows.c

@@ -144,8 +144,16 @@ int mdbx_txn_lock(MDBX_env *env, bool dontwait) {
     if (!TryEnterCriticalSection(&env->me_windowsbug_lock))
       return MDBX_BUSY;
   } else {
+    __try {
       EnterCriticalSection(&env->me_windowsbug_lock);
     }
+    __except ((GetExceptionCode() ==
+                 0xC0000194 /* STATUS_POSSIBLE_DEADLOCK / EXCEPTION_POSSIBLE_DEADLOCK */)
+                    ? EXCEPTION_EXECUTE_HANDLER
+                    : EXCEPTION_CONTINUE_SEARCH) {
+      return ERROR_POSSIBLE_DEADLOCK;
+    }
+  }
 
   if ((env->me_flags & MDBX_EXCLUSIVE) ||
       flock(env->me_lazy_fd,

src/ntdll.def

@@ -1242,3 +1242,5 @@ wcsstr
 wcstol
 wcstombs
 wcstoul
+__C_specific_handler
+_except_handler4_common

src/osal.c

@@ -492,7 +492,15 @@ MDBX_INTERNAL_FUNC int mdbx_fastmutex_destroy(mdbx_fastmutex_t *fastmutex) {
 
 MDBX_INTERNAL_FUNC int mdbx_fastmutex_acquire(mdbx_fastmutex_t *fastmutex) {
 #if defined(_WIN32) || defined(_WIN64)
+  __try {
     EnterCriticalSection(fastmutex);
+  } __except (
+      (GetExceptionCode() ==
+       0xC0000194 /* STATUS_POSSIBLE_DEADLOCK / EXCEPTION_POSSIBLE_DEADLOCK */)
+          ? EXCEPTION_EXECUTE_HANDLER
+          : EXCEPTION_CONTINUE_SEARCH) {
+    return ERROR_POSSIBLE_DEADLOCK;
+  }
   return MDBX_SUCCESS;
 #else
   return pthread_mutex_lock(fastmutex);

src/osal.h

@@ -146,6 +146,7 @@ __extern_C key_t ftok(const char *, int);
 #ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
 #endif
+#include <excpt.h>
 #include <tlhelp32.h>
 #include <windows.h>
 #include <winnt.h>