[4074] Undid for_detector stuff

src/lib/util/Makefile.am

@@ -10,7 +10,6 @@ lib_LTLIBRARIES = libkea-util.la
 libkea_util_la_SOURCES  = boost_time_utils.h boost_time_utils.cc
 libkea_util_la_SOURCES += csv_file.h csv_file.cc
 libkea_util_la_SOURCES += filename.h filename.cc
-libkea_util_la_SOURCES += fork_detector.h
 libkea_util_la_SOURCES += strutil.h strutil.cc
 libkea_util_la_SOURCES += buffer.h io_utilities.h
 libkea_util_la_SOURCES += time_utilities.h time_utilities.cc

src/lib/util/fork_detector.h

@@ -1,62 +0,0 @@
-// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
-//
-// Permission to use, copy, modify, and/or distribute this software for any
-// purpose with or without fee is hereby granted, provided that the above
-// copyright notice and this permission notice appear in all copies.
-//
-// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
-// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
-// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
-// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
-// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
-// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
-// PERFORMANCE OF THIS SOFTWARE.
-
-#ifndef FORK_DETECTOR_H
-#define FORK_DETECTOR_H
-
-#include <sys/types.h>
-#include <unistd.h>
-
-namespace isc {
-namespace util {
-
-/// @brief Class which detects being child process.
-///
-/// This class detects if it is in the child process, by checking if the
-/// process PID matches the PID of the process which created instance of
-/// the class.
-///
-/// Detecting if we're in the child process is important when the application
-/// spawns new process using fork/exec. If exec step fails for any reason
-/// the child process exits. However, to exit gracefully the process may
-/// need to know if it is a child or parent and take a different path
-/// during destruction.
-class ForkDetector {
-public:
-
-    /// @brief Constructor.
-    ///
-    /// Stores the PID of the process creating this instance.
-    ForkDetector()
-        : creator_pid_(getpid()) {
-    }
-
-    /// @brief Check if the process is a parent process;
-    ///
-    /// @return true if the process is a parent process.
-    bool isParent() const {
-        return (getpid() == creator_pid_);
-    }
-
-private:
-
-    /// @brief PID of the process which created instance of this class.
-    pid_t creator_pid_;
-
-};
-
-} // namespace isc::util
-} // namespace isc
-
-#endif // FORK_DETECTOR_H

src/lib/util/threads/thread.cc

@@ -12,7 +12,6 @@
 // OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 // PERFORMANCE OF THIS SOFTWARE.
 
-#include <util/fork_detector.h>
 #include <util/threads/thread.h>
 #include <util/threads/sync.h>
 
@@ -75,8 +74,7 @@ public:
         // and the creating thread needs to release it.
         waiting_(2),
         main_(main),
-        exception_(false),
-        fork_detector_()
+        exception_(false)
     {}
     // Another of the waiting events is done. If there are no more, delete
     // impl.
@@ -127,8 +125,6 @@ public:
     Mutex mutex_;
     // Which thread are we talking about anyway?
     pthread_t tid_;
-    // Class to detect if we're in the child or parent process.
-    ForkDetector fork_detector_;
 };
 
 Thread::Thread(const boost::function<void ()>& main) :
@@ -152,15 +148,8 @@ Thread::Thread(const boost::function<void ()>& main) :
 
 Thread::~Thread() {
     if (impl_ != NULL) {
-
-        int result = pthread_detach(impl_->tid_);
-        // If the error indicates that thread doesn't exist but we're
-        // in child process (after fork) it is expected. We should
-        // not cause an assert.
-        if (result == ESRCH && !impl_->fork_detector_.isParent()) {
-            result = 0;
-        }
-
+        // In case we didn't call wait yet
+        const int result = pthread_detach(impl_->tid_);
         Impl::done(impl_);
         impl_ = NULL;
         // If the detach ever fails, something is screwed rather badly.
@@ -175,20 +164,13 @@ Thread::wait() {
                   "Wait called and no thread to wait for");
     }
 
-    // Was there an exception in the thread?
-    scoped_ptr<UncaughtException> ex;
-
     const int result = pthread_join(impl_->tid_, NULL);
     if (result != 0) {
-        // We will not throw exception if the error indicates that the
-        // thread doesn't exist and we are in the child process (forked).
-        // For the child process it is expected that the thread is not
-        // re-created when we fork.
-        if (result != ESRCH || impl_->fork_detector_.isParent()) {
-            isc_throw(isc::InvalidOperation, std::strerror(result));
-        }
+        isc_throw(isc::InvalidOperation, std::strerror(result));
     }
 
+    // Was there an exception in the thread?
+    scoped_ptr<UncaughtException> ex;
     // Something here could in theory throw. But we already terminated the thread, so
     // we need to make sure we are in consistent state even in such situation (like
     // releasing the mutex and impl_).