From 5a1f388db5e8b12b17bc4bf4ac31e3ddcf2598af Mon Sep 17 00:00:00 2001
From: Leo Yuriev <leo@yuriev.ru>
Date: Wed, 1 Aug 2018 18:16:40 +0300
Subject: [PATCH] mdbx: drop unused mdbx_lck_upgrade().

---
 src/lck-posix.c   |  2 --
 src/lck-windows.c | 45 ---------------------------------------------
 src/osal.h        |  1 -
 3 files changed, 48 deletions(-)

diff --git a/src/lck-posix.c b/src/lck-posix.c
index 869b98c0..8559bb60 100644
--- a/src/lck-posix.c
+++ b/src/lck-posix.c
@@ -90,8 +90,6 @@ int mdbx_lck_downgrade(MDBX_env *env, bool complete) {
   return complete ? mdbx_lck_shared(env->me_lfd) : MDBX_SUCCESS;
 }
 
-int mdbx_lck_upgrade(MDBX_env *env) { return mdbx_lck_exclusive(env->me_lfd); }
-
 int mdbx_rpid_set(MDBX_env *env) {
   assert(env->me_lfd != INVALID_HANDLE_VALUE);
   return mdbx_lck_op(env->me_lfd, F_SETLK, F_WRLCK, env->me_pid, 1);
diff --git a/src/lck-windows.c b/src/lck-windows.c
index 02b074e9..7da07559 100644
--- a/src/lck-windows.c
+++ b/src/lck-windows.c
@@ -457,51 +457,6 @@ int mdbx_lck_downgrade(MDBX_env *env, bool complete) {
   return MDBX_SUCCESS /* 7) now at S-? (used), done */;
 }
 
-int mdbx_lck_upgrade(MDBX_env *env) {
-  /* Transite from locked state (S-E) to exclusive-write (E-E) */
-  assert(env->me_fd != INVALID_HANDLE_VALUE);
-  assert(env->me_lfd != INVALID_HANDLE_VALUE);
-  assert((env->me_flags & MDBX_EXCLUSIVE) == 0);
-
-  if (env->me_flags & MDBX_EXCLUSIVE)
-    return MDBX_RESULT_TRUE /* files were must be opened non-shareable */;
-
-  /* 1) must be at S-E (locked), transite to ?_E (middle) */
-  if (!funlock(env->me_lfd, LCK_LOWER))
-    mdbx_panic("%s(%s) failed: errcode %u", mdbx_func_,
-               "S-E(locked) >> ?-E(middle)", GetLastError());
-
-  /* 3) now on ?-E (middle), try E-E (exclusive-write) */
-  mdbx_jitter4testing(false);
-  if (flock(env->me_lfd, LCK_EXCLUSIVE | LCK_DONTWAIT, LCK_LOWER))
-    return MDBX_RESULT_TRUE; /* 4) got E-E (exclusive-write), done */
-
-  /* 5) still on ?-E (middle) */
-  int rc = GetLastError();
-  mdbx_jitter4testing(false);
-  if (rc != ERROR_SHARING_VIOLATION && rc != ERROR_LOCK_VIOLATION) {
-    /* 6) something went wrong, report but continue */
-    mdbx_error("%s(%s) failed: errcode %u", mdbx_func_,
-               "?-E(middle) >> E-E(exclusive-write)", rc);
-  }
-
-  /* 7) still on ?-E (middle), try restore S-E (locked) */
-  mdbx_jitter4testing(false);
-  rc = flock(env->me_lfd, LCK_SHARED | LCK_DONTWAIT, LCK_LOWER)
-           ? MDBX_RESULT_FALSE
-           : GetLastError();
-
-  mdbx_jitter4testing(false);
-  if (rc != MDBX_RESULT_FALSE) {
-    mdbx_fatal("%s(%s) failed: errcode %u", mdbx_func_,
-               "?-E(middle) >> S-E(locked)", rc);
-    return rc;
-  }
-
-  /* 8) now on S-E (locked) */
-  return MDBX_RESULT_FALSE;
-}
-
 void mdbx_lck_destroy(MDBX_env *env) {
   int rc;
 
diff --git a/src/osal.h b/src/osal.h
index daa79064..a1feb998 100644
--- a/src/osal.h
+++ b/src/osal.h
@@ -552,7 +552,6 @@ int mdbx_lck_init(MDBX_env *env);
 
 int mdbx_lck_seize(MDBX_env *env);
 int mdbx_lck_downgrade(MDBX_env *env, bool complete);
-int mdbx_lck_upgrade(MDBX_env *env);
 void mdbx_lck_destroy(MDBX_env *env);
 
 int mdbx_rdt_lock(MDBX_env *env);