X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FLockFileManager.cpp;h=8fc58017cb0f287f57045c28b79a6fe6dc8d95e0;hb=9f52e1da3c6a6e798733704b0acf6920d00eb3d2;hp=55858473f598bf22d6197f1002f0aa2b83c41246;hpb=fb307be5afa79bc65b75885ee6c3ced3b450b037;p=oota-llvm.git

diff --git a/lib/Support/LockFileManager.cpp b/lib/Support/LockFileManager.cpp
index 55858473f59..8fc58017cb0 100644
--- a/lib/Support/LockFileManager.cpp
+++ b/lib/Support/LockFileManager.cpp
@@ -9,6 +9,7 @@
 #include "llvm/Support/LockFileManager.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/Support/Errc.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/MemoryBuffer.h"
 #include "llvm/Support/Path.h"
@@ -32,19 +33,24 @@ Optional<std::pair<std::string, int> >
 LockFileManager::readLockFile(StringRef LockFileName) {
   // Read the owning host and PID out of the lock file. If it appears that the
   // owning process is dead, the lock file is invalid.
-  std::unique_ptr<MemoryBuffer> MB;
-  if (MemoryBuffer::getFile(LockFileName, MB)) {
+  ErrorOr<std::unique_ptr<MemoryBuffer>> MBOrErr =
+      MemoryBuffer::getFile(LockFileName);
+  if (!MBOrErr) {
     sys::fs::remove(LockFileName);
     return None;
   }
+  MemoryBuffer &MB = *MBOrErr.get();
 
   StringRef Hostname;
   StringRef PIDStr;
-  std::tie(Hostname, PIDStr) = getToken(MB->getBuffer(), " ");
+  std::tie(Hostname, PIDStr) = getToken(MB.getBuffer(), " ");
   PIDStr = PIDStr.substr(PIDStr.find_first_not_of(" "));
   int PID;
-  if (!PIDStr.getAsInteger(10, PID))
-    return std::make_pair(std::string(Hostname), PID);
+  if (!PIDStr.getAsInteger(10, PID)) {
+    auto Owner = std::make_pair(std::string(Hostname), PID);
+    if (processStillExecuting(Owner.first, Owner.second))
+      return Owner;
+  }
 
   // Delete the lock file. It's invalid anyway.
   sys::fs::remove(LockFileName);
@@ -68,7 +74,11 @@ bool LockFileManager::processStillExecuting(StringRef Hostname, int PID) {
 LockFileManager::LockFileManager(StringRef FileName)
 {
   this->FileName = FileName;
-  LockFileName = FileName;
+  if (std::error_code EC = sys::fs::make_absolute(this->FileName)) {
+    Error = EC;
+    return;
+  }
+  LockFileName = this->FileName;
   LockFileName += ".lock";
 
   // If the lock file already exists, don't bother to try to create our own
@@ -80,10 +90,8 @@ LockFileManager::LockFileManager(StringRef FileName)
   UniqueLockFileName = LockFileName;
   UniqueLockFileName += "-%%%%%%%%";
   int UniqueLockFileID;
-  if (error_code EC
-        = sys::fs::createUniqueFile(UniqueLockFileName.str(),
-                                    UniqueLockFileID,
-                                    UniqueLockFileName)) {
+  if (std::error_code EC = sys::fs::createUniqueFile(
+          UniqueLockFileName.str(), UniqueLockFileID, UniqueLockFileName)) {
     Error = EC;
     return;
   }
@@ -115,10 +123,9 @@ LockFileManager::LockFileManager(StringRef FileName)
 
   while (1) {
     // Create a link from the lock file name. If this succeeds, we're done.
-    error_code EC =
-        sys::fs::create_link(sys::path::filename(UniqueLockFileName.str()),
-                             LockFileName.str());
-    if (EC == errc::success)
+    std::error_code EC =
+        sys::fs::create_link(UniqueLockFileName.str(), LockFileName.str());
+    if (!EC)
       return;
 
     if (EC != errc::file_exists) {
@@ -168,9 +175,9 @@ LockFileManager::~LockFileManager() {
   sys::fs::remove(UniqueLockFileName.str());
 }
 
-void LockFileManager::waitForUnlock() {
+LockFileManager::WaitForUnlockResult LockFileManager::waitForUnlock() {
   if (getState() != LFS_Shared)
-    return;
+    return Res_Success;
 
 #if LLVM_ON_WIN32
   unsigned long Interval = 1;
@@ -190,7 +197,7 @@ void LockFileManager::waitForUnlock() {
 #if LLVM_ON_WIN32
     Sleep(Interval);
 #else
-    nanosleep(&Interval, NULL);
+    nanosleep(&Interval, nullptr);
 #endif
     bool LockFileJustDisappeared = false;
 
@@ -208,7 +215,7 @@ void LockFileManager::waitForUnlock() {
     // available now.
     if (LockFileGone) {
       if (sys::fs::exists(FileName.str())) {
-        return;
+        return Res_Success;
       }
 
       // The lock file is gone, so now we're waiting for the original file to
@@ -231,7 +238,7 @@ void LockFileManager::waitForUnlock() {
     // owning the lock died without cleaning up, just bail out.
     if (!LockFileGone &&
         !processStillExecuting((*Owner).first, (*Owner).second)) {
-      return;
+      return Res_OwnerDied;
     }
 
     // Exponentially increase the time we wait for the lock to be removed.
@@ -254,4 +261,5 @@ void LockFileManager::waitForUnlock() {
            );
 
   // Give up.
+  return Res_Timeout;
 }