From patchwork Tue Sep 15 14:20:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Paul Elder X-Patchwork-Id: 9611 Return-Path: X-Original-To: parsemail@patchwork.libcamera.org Delivered-To: parsemail@patchwork.libcamera.org Received: from lancelot.ideasonboard.com (lancelot.ideasonboard.com [92.243.16.209]) by patchwork.libcamera.org (Postfix) with ESMTPS id 2797BBF01C for ; Tue, 15 Sep 2020 14:21:04 +0000 (UTC) Received: from lancelot.ideasonboard.com (localhost [IPv6:::1]) by lancelot.ideasonboard.com (Postfix) with ESMTP id 1275F62E1B; Tue, 15 Sep 2020 16:21:03 +0200 (CEST) Authentication-Results: lancelot.ideasonboard.com; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="nln4C0e7"; dkim-atps=neutral Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by lancelot.ideasonboard.com (Postfix) with ESMTPS id A1F76603EE for ; Tue, 15 Sep 2020 16:21:01 +0200 (CEST) Received: from pyrite.rasen.tech (unknown [IPv6:2400:4051:61:600:2c71:1b79:d06d:5032]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id A12A7AEA; Tue, 15 Sep 2020 16:20:52 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1600179654; bh=hZ5z9Pn83/b9ODQDApDcjez+uT4fueazDjez05BOfEM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nln4C0e7U2NTC+07ZbVVju6fHevo+MWJB5vVkfBREKzxnGyqDM5rgbylVJLp2Ve54 Di+JKaQsVTyiLkK0myJjr/tL9KgcPM75T67ayJLUv7q9BuGOEUCN/+6SZAuB0VvVTu l+31JE2fd4ufF5f2I2U/BlkczwBNP+r5TXb8zFoM= From: Paul Elder To: libcamera-devel@lists.libcamera.org Date: Tue, 15 Sep 2020 23:20:16 +0900 Message-Id: <20200915142038.28757-2-paul.elder@ideasonboard.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200915142038.28757-1-paul.elder@ideasonboard.com> References: <20200915142038.28757-1-paul.elder@ideasonboard.com> MIME-Version: 1.0 Subject: [libcamera-devel] [PATCH 01/23] libcamera: ProcessManager: make ProcessManager lifetime explicitly managed X-BeenThere: libcamera-devel@lists.libcamera.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libcamera-devel-bounces@lists.libcamera.org Sender: "libcamera-devel" If any Process instances are destroyed after the ProcessManager is destroyed, then a segfault will occur. Fix this by making the lifetime of the ProcessManager explicit, and make the CameraManager construct and deconstruct (automatically, via a unique pointer) the ProcessManager. Signed-off-by: Paul Elder Reviewed-by: Laurent Pinchart Reviewed-by: Niklas Söderlund --- include/libcamera/internal/process.h | 27 ++++++++++++++++ src/libcamera/camera_manager.cpp | 2 ++ src/libcamera/process.cpp | 46 ++++++++++++---------------- 3 files changed, 48 insertions(+), 27 deletions(-) diff --git a/include/libcamera/internal/process.h b/include/libcamera/internal/process.h index 36595106..df697c7f 100644 --- a/include/libcamera/internal/process.h +++ b/include/libcamera/internal/process.h @@ -7,6 +7,7 @@ #ifndef __LIBCAMERA_INTERNAL_PROCESS_H__ #define __LIBCAMERA_INTERNAL_PROCESS_H__ +#include #include #include @@ -50,6 +51,32 @@ private: friend class ProcessManager; }; +class ProcessManager +{ +public: + ProcessManager(); + ~ProcessManager(); + + void registerProcess(Process *proc); + + static ProcessManager *instance(); + + int writePipe() const; + + const struct sigaction &oldsa() const; + +private: + static ProcessManager *self_; + + void sighandler(EventNotifier *notifier); + + std::list processes_; + + struct sigaction oldsa_; + EventNotifier *sigEvent_; + int pipe_[2]; +}; + } /* namespace libcamera */ #endif /* __LIBCAMERA_INTERNAL_PROCESS_H__ */ diff --git a/src/libcamera/camera_manager.cpp b/src/libcamera/camera_manager.cpp index 47d56256..b8d3ccc8 100644 --- a/src/libcamera/camera_manager.cpp +++ b/src/libcamera/camera_manager.cpp @@ -18,6 +18,7 @@ #include "libcamera/internal/ipa_manager.h" #include "libcamera/internal/log.h" #include "libcamera/internal/pipeline_handler.h" +#include "libcamera/internal/process.h" #include "libcamera/internal/thread.h" #include "libcamera/internal/utils.h" @@ -67,6 +68,7 @@ private: std::unique_ptr enumerator_; IPAManager ipaManager_; + ProcessManager processManager_; }; CameraManager::Private::Private(CameraManager *cm) diff --git a/src/libcamera/process.cpp b/src/libcamera/process.cpp index 994190dc..72b5afe2 100644 --- a/src/libcamera/process.cpp +++ b/src/libcamera/process.cpp @@ -41,28 +41,6 @@ LOG_DEFINE_CATEGORY(Process) * The ProcessManager singleton keeps track of all created Process instances, * and manages the signal handling involved in terminating processes. */ -class ProcessManager -{ -public: - void registerProcess(Process *proc); - - static ProcessManager *instance(); - - int writePipe() const; - - const struct sigaction &oldsa() const; - -private: - void sighandler(EventNotifier *notifier); - ProcessManager(); - ~ProcessManager(); - - std::list processes_; - - struct sigaction oldsa_; - EventNotifier *sigEvent_; - int pipe_[2]; -}; namespace { @@ -127,8 +105,20 @@ void ProcessManager::registerProcess(Process *proc) processes_.push_back(proc); } +ProcessManager *ProcessManager::self_ = nullptr; + +/** + * \brief Construct a ProcessManager instance + * + * The ProcessManager class is meant to only be instantiated once, by the + * CameraManager. + */ ProcessManager::ProcessManager() { + if (self_) + LOG(Process, Fatal) + << "Multiple ProcessManager objects are not allowed"; + sigaction(SIGCHLD, NULL, &oldsa_); struct sigaction sa; @@ -145,6 +135,8 @@ ProcessManager::ProcessManager() << "Failed to initialize pipe for signal handling"; sigEvent_ = new EventNotifier(pipe_[0], EventNotifier::Read); sigEvent_->activated.connect(this, &ProcessManager::sighandler); + + self_ = this; } ProcessManager::~ProcessManager() @@ -153,21 +145,21 @@ ProcessManager::~ProcessManager() delete sigEvent_; close(pipe_[0]); close(pipe_[1]); + + self_ = nullptr; } /** * \brief Retrieve the Process manager instance * - * The ProcessManager is a singleton and can't be constructed manually. This - * method shall instead be used to retrieve the single global instance of the - * manager. + * The ProcessManager is constructed by the CameraManager. This function shall + * be used to retrieve the single instance of the manager. * * \return The Process manager instance */ ProcessManager *ProcessManager::instance() { - static ProcessManager processManager; - return &processManager; + return self_; } /**