mirror of
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498 lines
25 KiB
C
498 lines
25 KiB
C
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// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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// % Project : GUSI - Grand Unified Socket Interface
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// % File : GUSIContext.nw - Thread and Process structures
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// % Author : Matthias Neeracher
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// % Language : C++
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// %
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// % $Log: GUSIContext.h,v $
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// % Revision 1.1 2001/03/11 22:33:38 sgehani%netscape.com
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// % First Checked In.
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// %
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// % Revision 1.22 2001/01/22 04:31:11 neeri
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// % Last minute changes for 2.1.5
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// %
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// % Revision 1.21 2001/01/17 08:43:42 neeri
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// % Tweak scheduling
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// %
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// % Revision 1.20 2000/12/23 06:09:21 neeri
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// % May need to create context for IO completions
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// %
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// % Revision 1.19 2000/10/16 04:34:22 neeri
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// % Releasing 2.1.2
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// %
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// % Revision 1.18 2000/06/01 06:31:09 neeri
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// % Delete SigContext
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// %
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// % Revision 1.17 2000/05/23 06:56:19 neeri
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// % Improve formatting, add socket closing queue, tune scheduling
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// %
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// % Revision 1.16 2000/03/15 07:11:50 neeri
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// % Fix detached delete (again), switcher restore
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// %
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// % Revision 1.15 2000/03/06 08:10:09 neeri
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// % Fix sleep in main thread
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// %
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// % Revision 1.14 2000/03/06 06:13:46 neeri
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// % Speed up thread/process switching through minimal quotas
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// %
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// % Revision 1.13 1999/12/13 02:40:50 neeri
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// % GUSISetThreadSwitcher had Boolean <-> bool inconsistency
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// %
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// % Revision 1.12 1999/11/15 07:25:32 neeri
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// % Safe context setup. Check interrupts only in foreground.
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// %
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// % Revision 1.11 1999/09/09 07:18:06 neeri
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// % Added support for foreign threads
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// %
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// % Revision 1.10 1999/08/26 05:44:59 neeri
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// % Fixes for literate edition of source code
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// %
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// % Revision 1.9 1999/06/28 05:59:02 neeri
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// % Add signal handling support
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// %
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// % Revision 1.8 1999/05/30 03:09:29 neeri
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// % Added support for MPW compilers
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// %
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// % Revision 1.7 1999/03/17 09:05:05 neeri
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// % Added GUSITimer, expanded docs
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// %
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// % Revision 1.6 1999/02/25 03:34:24 neeri
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// % Introduced GUSIContextFactory, simplified wakeup
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// %
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// % Revision 1.5 1998/11/22 23:06:51 neeri
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// % Releasing 2.0a4 in a hurry
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// %
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// % Revision 1.4 1998/10/11 16:45:11 neeri
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// % Ready to release 2.0a2
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// %
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// % Revision 1.3 1998/08/01 21:26:18 neeri
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// % Switch dynamically to threading model
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// %
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// % Revision 1.2 1998/02/11 12:57:11 neeri
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// % PowerPC Build
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// %
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// % Revision 1.1 1998/01/25 21:02:41 neeri
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// % Engine implemented, except for signals & scheduling
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// %
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// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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//
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// \chapter{Thread and Process structures}
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//
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// This section defines the process and thread switching engine of GUSI.
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//
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// In some execution environments, completion routines execute at interrupt level.
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// GUSI therefore is designed so all information needed to operate from interrupt
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// level is accessible from a [[GUSISocket]]. This information is separated into
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// per-process data, collected in [[GUSIProcess]], and per-thread data, collected
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// in [[GUSIContext]]. [[GUSIProcess]] is always a singleton, while [[GUSIContext]]
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// is a singleton if threading is disabled, and has multiple instances if threading
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// is enabled. By delegating the [[GUSIContext]] creation process to an instance
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// of a [[GUSIContextFactory]], we gain some extra flexibility.
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//
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// As soon as GUSI has started an asynchronous call, it calls the [[Wait]] member
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// function of its context. [[msec]] will set a time limit after which the call will
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// return in any case. Exceptional events may also cause [[GUSIWait]] to return, so
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// it is not safe to assume that the call will have completed upon return.
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//
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//
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// <GUSIContext.h>=
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#ifndef _GUSIContext_
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#define _GUSIContext_
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#include <errno.h>
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#include <sys/cdefs.h>
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#include <sys/signal.h>
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#include <MacTypes.h>
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#include <Threads.h>
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__BEGIN_DECLS
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// To maintain correct state, we have to remain informed which thread is active, so
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// we install all sorts of hooks. Clients have to use the C++ interface or call
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// [[GUSINewThread]], [[GUSISetThreadSwitcher]], and [[GUSISetThreadTerminator]].
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// instead of the thread manager routines.
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//
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// <Definition of thread manager hooks>=
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OSErr GUSINewThread(
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ThreadStyle threadStyle, ThreadEntryProcPtr threadEntry, void *threadParam,
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Size stackSize, ThreadOptions options,
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void **threadResult, ThreadID *threadMade);
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OSErr GUSISetThreadSwitcher(ThreadID thread,
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ThreadSwitchProcPtr threadSwitcher, void *switchProcParam, Boolean inOrOut);
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OSErr GUSISetThreadTerminator(ThreadID thread,
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ThreadTerminationProcPtr threadTerminator, void *terminationProcParam);
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__END_DECLS
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#ifndef GUSI_SOURCE
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typedef struct GUSIContext GUSIContext;
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#else
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#include "GUSISpecific.h"
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#include "GUSIBasics.h"
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#include "GUSIContextQueue.h"
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#include <Files.h>
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#include <Processes.h>
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#include <OSUtils.h>
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// \section{Definition of completion handling}
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//
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// {\tt GUSIContext} is heavily circular both with classes declared herein and
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// in other files. Therefore, we start by declaring a few class names.
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//
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// <Name dropping for file GUSIContext>=
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class GUSISocket;
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class GUSIContext;
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class GUSIProcess;
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class GUSISigProcess;
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class GUSISigContext;
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class GUSITimer;
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#include <ConditionalMacros.h>
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#if PRAGMA_STRUCT_ALIGN
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#pragma options align=native
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#endif
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// Ultimately, we will call through to the thread manager, but if an application uses foreign
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// sources of threads, we might have to go through indirections.
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//
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// <Definition of class [[GUSIThreadManagerProxy]]>=
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class GUSIThreadManagerProxy {
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public:
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virtual OSErr NewThread(
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ThreadStyle threadStyle, ThreadEntryProcPtr threadEntry, void *threadParam,
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Size stackSize, ThreadOptions options, void **threadResult, ThreadID *threadMade);
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virtual OSErr SetThreadSwitcher(
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ThreadID thread, ThreadSwitchProcPtr threadSwitcher, void *switchProcParam,
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Boolean inOrOut);
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virtual OSErr SetThreadTerminator(
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ThreadID thread, ThreadTerminationProcPtr threadTerminator, void *terminatorParam);
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virtual ~GUSIThreadManagerProxy() {}
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static GUSIThreadManagerProxy * Instance();
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protected:
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GUSIThreadManagerProxy() {}
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static GUSIThreadManagerProxy * MakeInstance();
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};
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// A [[GUSIProcess]] contains all the data needed to wake up a process:
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//
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// \begin{itemize}
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// \item The [[ProcessSerialNumber]] of the process.
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// \item The [[ThreadTaskRef]] if threads are enabled.
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// \item The contents of the A5 register.
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// \end{itemize}
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//
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// The sole instance of [[GUSIProcess]] is obtained by calling the [[GUSIProcess::Instance]] static member
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// function, which will create the instance if necessary. Interrupt level prcedures may access the application's
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// A5 register either manually by calling [[GetA5]] or simply by declaring a [[GUSIProcess::A5Saver]] in a scope.
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//
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// <Definition of class [[GUSIProcess]]>=
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enum GUSIYieldMode {
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kGUSIPoll, // Busy wait for some unblockable condition
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kGUSIBlock, // Wait for some blockable condition
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kGUSIYield // Yield to some other eligible thread
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};
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class GUSIProcess {
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public:
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static GUSIProcess * Instance();
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static void DeleteInstance();
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void GetPSN(ProcessSerialNumber * psn);
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void AcquireTaskRef();
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ThreadTaskRef GetTaskRef();
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long GetA5();
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bool Threading();
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void Yield(GUSIYieldMode wait);
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void Wakeup();
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GUSISigProcess * SigProcess() { return fSigProcess; }
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void QueueForClose(GUSISocket * sock);
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// A [[GUSIProcess::A5Saver]] is a class designed to restore the process A5
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// register for the scope of its declaration.
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//
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// <Definition of class [[GUSIProcess::A5Saver]]>=
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class A5Saver {
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public:
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A5Saver(long processA5);
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A5Saver(GUSIContext * context);
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A5Saver(GUSIProcess * process);
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~A5Saver();
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private:
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long fSavedA5;
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};
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protected:
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friend class GUSIContext;
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GUSIProcess(bool threading);
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~GUSIProcess();
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int fReadyThreads;
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int fExistingThreads;
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GUSISigProcess * fSigProcess;
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private:
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// \section{Implementation of completion handling}
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//
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// [[Instance]] returns the sole instance of [[GUSIProcess]], creating it if
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// necessary.
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//
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// <Privatissima of [[GUSIProcess]]>=
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static GUSIProcess * sInstance;
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// Much of the information stored in a [[GUSIProcess]] is static and read-only.
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//
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// <Privatissima of [[GUSIProcess]]>=
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ProcessSerialNumber fProcess;
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ThreadTaskRef fTaskRef;
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long fA5;
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// The exception is the [[fClosing]] socket queue and some yielding related flags.
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//
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// <Privatissima of [[GUSIProcess]]>=
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GUSISocket * fClosing;
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UInt32 fResumeTicks;
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bool fWillSleep;
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bool fDontSleep;
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};
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// A [[GUSIContext]] gathers thread related data. The central operation on a
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// [[GUSIContext]] is [[Wakeup]]. If the process is not asleep when [[Wakeup]]
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// is called, it is marked for deferred wakeup.
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//
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// A [[GUSIContext]] can either be created from an existing thread manager
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// [[ThreadID]] or by specifying the parameters for a [[NewThread]] call.
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//
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// [[Current]] returns the current [[GUSIContext]]. [[Setup]] initializes the
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// default context for either the threading or the non-threading model.
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//
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// [[Yield]] suspends the current process or thread until something interesting
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// happens if [[wait]] is [[kGUSIBlock]. Otherwise, [[Yield]] switches,
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// but does not suspend. For an ordinary thread context, [[Yield]] simply yields
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// the thread. For the context in a non-threading application, [[Yield]] does a
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// [[WaitNextEvent]]. For the main thread context, [[Yield]] does both.
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//
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// [[Done]] tests whether the thread has terminated yet. If [[join]] is set,
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// the caller is willing to wait. [[Result]] returns the default location to store
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// the thread result if no other is specified.
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//
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// By default, a context is joinable. Calling [[Detach]] will cause the context to
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// be destroyed automatically upon thread termination, and joins are no longer allowed.
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// A joinable context will not be destroyed automatically before the end of the
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// program, so you will have to call [[Liquidate]] to do that.
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//
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// [[SetSwitchIn]], [[SetSwitchOut]], and [[SetTerminator]] set per-thread user
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// switch and termination procedures. [[SwitchIn]], [[SwitchOut]], and [[Terminate]]
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// call the user defined procedures then perform their own actions.
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//
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// <Definition of class [[GUSIContext]]>=
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class GUSIContext : public GUSISpecificTable {
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public:
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friend class GUSIProcess;
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friend class GUSIContextFactory;
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ThreadID ID() { return fThreadID; }
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virtual void Wakeup();
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void ClearWakeups() { fWakeup = false; }
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GUSIProcess * Process() { return fProcess; }
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void Detach() { fFlags |= detached; }
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void Liquidate();
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OSErr Error() { return sError; }
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bool Done(bool join);
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void * Result() { return fResult; }
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GUSISigContext * SigContext() { return fSigContext; }
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static GUSIContext * Current() { return sCurrentContext; }
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static GUSIContext * CreateCurrent(bool threading = false)
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{ if (!sCurrentContext) Setup(threading); return sCurrentContext; }
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static GUSIContext * Lookup(ThreadID id);
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static void Setup(bool threading);
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static bool Yield(GUSIYieldMode wait);
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static void SigWait(sigset_t sigs);
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static void SigSuspend();
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static bool Raise(bool allSigs = false);
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static sigset_t Pending();
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static sigset_t Blocked();
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void SetSwitchIn(ThreadSwitchProcPtr switcher, void *switchParam);
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void SetSwitchOut(ThreadSwitchProcPtr switcher, void *switchParam);
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void SetTerminator(ThreadTerminationProcPtr terminator, void *terminationParam);
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static GUSIContextQueue::iterator begin() { return sContexts.begin(); }
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static GUSIContextQueue::iterator end() { return sContexts.end(); }
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static void LiquidateAll() { sContexts.LiquidateAll(); }
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protected:
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// <Friends of [[GUSIContext]]>=
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friend class GUSIContextFactory;
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// The thread switcher updates the pointer to the current context and switches
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// the global error variables.
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//
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// <Friends of [[GUSIContext]]>=
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friend pascal void GUSIThreadSwitchIn(ThreadID thread, GUSIContext * context);
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friend pascal void GUSIThreadSwitchOut(ThreadID thread, GUSIContext * context);
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// The terminator wakes up the joining thread if a join is pending.
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//
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// <Friends of [[GUSIContext]]>=
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friend pascal void GUSIThreadTerminator(ThreadID thread, GUSIContext * context);
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GUSIContext(ThreadID id);
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GUSIContext(
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ThreadEntryProcPtr threadEntry, void *threadParam,
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Size stackSize, ThreadOptions options = kCreateIfNeeded,
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void **threadResult = nil, ThreadID *threadMade = nil);
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virtual void SwitchIn();
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virtual void SwitchOut();
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virtual void Terminate();
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// At this point, we need to introduce all the private data of a [[GUSIContext]].
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//
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// \begin{itemize}
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// \item [[fThreadID]] stores the thread manager thread ID.
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// \item [[fProcess]] keeps a pointer to the process structure, so completion
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// routines can get at it.
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// \item [[sCurrentContext]] always points at the current context.
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// \item [[sContexts]] contains a queue of all contexts.
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// \item [[sHasThreads]] reminds us whether we are threading or not.
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// \item We define our own switch-in and termination procedures. If the user specifies procedures
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// we store them in [[fSwitchInProc]], [[fSwitchOutProc]], and [[fTerminateProc]] and their parameters
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// in [[fSwitchInParam]], [[fSwitchOutParam]], and [[fTerminateParam]] so we can call through to them
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// from our procedures.
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// \item [[fJoin]] contains the context waiting for us to die;
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// \item [[done]] reminds us if the thread is still alive. [[detached]] guarantees
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// that we will never wait for that thread anymore.
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// \item Last of all, we keep the global error variables [[errno]] and [[h_errno]]
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// for each context in the [[fErrno]] and [[fHostErrno]] fields.
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// \end{itemize}
|
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//
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|
|
//
|
||
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// <Privatissima of [[GUSIContext]]>=
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||
|
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ThreadID fThreadID;
|
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|
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GUSIProcess * fProcess;
|
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|
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GUSIContext * fNext;
|
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|
|
GUSISigContext * fSigContext;
|
||
|
|
ThreadSwitchProcPtr fSwitchInProc;
|
||
|
|
ThreadSwitchProcPtr fSwitchOutProc;
|
||
|
|
ThreadTerminationProcPtr fTerminateProc;
|
||
|
|
void * fSwitchInParam;
|
||
|
|
void * fSwitchOutParam;
|
||
|
|
void * fTerminateParam;
|
||
|
|
void * fResult;
|
||
|
|
GUSIContext * fJoin;
|
||
|
|
enum {
|
||
|
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done = 1 << 0,
|
||
|
|
detached= 1 << 1,
|
||
|
|
asleep = 1 << 2
|
||
|
|
};
|
||
|
|
char fFlags;
|
||
|
|
bool fWakeup;
|
||
|
|
UInt32 fEntryTicks;
|
||
|
|
int fErrno;
|
||
|
|
int fHostErrno;
|
||
|
|
|
||
|
|
class Queue : public GUSIContextQueue {
|
||
|
|
public:
|
||
|
|
void LiquidateAll();
|
||
|
|
|
||
|
|
~Queue() { LiquidateAll(); }
|
||
|
|
};
|
||
|
|
|
||
|
|
static Queue sContexts;
|
||
|
|
static GUSIContext * sCurrentContext;
|
||
|
|
static bool sHasThreading;
|
||
|
|
static OSErr sError;
|
||
|
|
// The [[GUSIContext]] constructor links the context into the queue of existing
|
||
|
|
// contexts and installs the appropriate thread hooks. We split this into two
|
||
|
|
// routines: [[StartSetup]] does static setup before the thread id is determined,
|
||
|
|
// [[FinishSetup]] does the queueing.
|
||
|
|
//
|
||
|
|
// <Privatissima of [[GUSIContext]]>=
|
||
|
|
void StartSetup();
|
||
|
|
void FinishSetup();
|
||
|
|
// Destruction of a [[GUSIContext]] requires some cleanup.
|
||
|
|
//
|
||
|
|
// <Privatissima of [[GUSIContext]]>=
|
||
|
|
~GUSIContext();
|
||
|
|
};
|
||
|
|
// [[GUSIContext]] instances are created by instances of [[GUSIContextFactory]].
|
||
|
|
//
|
||
|
|
// <Definition of class [[GUSIContextFactory]]>=
|
||
|
|
class GUSIContextFactory {
|
||
|
|
public:
|
||
|
|
static GUSIContextFactory * Instance();
|
||
|
|
static void SetInstance(GUSIContextFactory * instance);
|
||
|
|
|
||
|
|
virtual GUSIContext * CreateContext(ThreadID id);
|
||
|
|
virtual GUSIContext * CreateContext(
|
||
|
|
ThreadEntryProcPtr threadEntry, void *threadParam,
|
||
|
|
Size stackSize, ThreadOptions options = kCreateIfNeeded,
|
||
|
|
void **threadResult = nil, ThreadID *threadMade = nil);
|
||
|
|
|
||
|
|
virtual ~GUSIContextFactory();
|
||
|
|
protected:
|
||
|
|
GUSIContextFactory();
|
||
|
|
};
|
||
|
|
// Many asynchronous calls take the same style of I/O parameter block and thus
|
||
|
|
// can be handled by the same completion procedure. [[StartIO]] prepares
|
||
|
|
// a parameter block for asynchronous I/O; [[FinishIO]] waits for the I/O
|
||
|
|
// to complete. The parameter block has to be wrapped in a [[GUSIIOPBWrapper]].
|
||
|
|
//
|
||
|
|
// <Definition of IO wrappers>=
|
||
|
|
void GUSIStartIO(IOParam * pb);
|
||
|
|
OSErr GUSIFinishIO(IOParam * pb);
|
||
|
|
OSErr GUSIControl(IOParam * pb);
|
||
|
|
template <class PB> struct GUSIIOPBWrapper {
|
||
|
|
GUSIContext * fContext;
|
||
|
|
PB fPB;
|
||
|
|
|
||
|
|
GUSIIOPBWrapper() {}
|
||
|
|
GUSIIOPBWrapper(const PB & pb) { memcpy(&fPB, &pb, sizeof(PB)); }
|
||
|
|
|
||
|
|
PB * operator->(){ return &fPB; }
|
||
|
|
void StartIO() { GUSIStartIO(reinterpret_cast<IOParam *>(&fPB)); }
|
||
|
|
OSErr FinishIO() { return GUSIFinishIO(reinterpret_cast<IOParam *>(&fPB)); }
|
||
|
|
OSErr Control() { return GUSIControl(reinterpret_cast<IOParam *>(&fPB)); }
|
||
|
|
};
|
||
|
|
|
||
|
|
#if PRAGMA_STRUCT_ALIGN
|
||
|
|
#pragma options align=reset
|
||
|
|
#endif
|
||
|
|
|
||
|
|
// <Inline member functions for file GUSIContext>=
|
||
|
|
inline GUSIProcess * GUSIProcess::Instance()
|
||
|
|
{
|
||
|
|
if (!sInstance)
|
||
|
|
sInstance = new GUSIProcess(GUSIContext::sHasThreading);
|
||
|
|
return sInstance;
|
||
|
|
}
|
||
|
|
inline void GUSIProcess::DeleteInstance()
|
||
|
|
{
|
||
|
|
delete sInstance;
|
||
|
|
sInstance = 0;
|
||
|
|
}
|
||
|
|
// <Inline member functions for file GUSIContext>=
|
||
|
|
inline void GUSIProcess::GetPSN(ProcessSerialNumber * psn)
|
||
|
|
{ *psn = fProcess; }
|
||
|
|
inline void GUSIProcess::AcquireTaskRef()
|
||
|
|
{ GetThreadCurrentTaskRef(&fTaskRef); }
|
||
|
|
inline ThreadTaskRef GUSIProcess::GetTaskRef()
|
||
|
|
{ return fTaskRef; }
|
||
|
|
inline long GUSIProcess::GetA5()
|
||
|
|
{ return fA5; }
|
||
|
|
inline bool GUSIProcess::Threading()
|
||
|
|
{ return fTaskRef!=0;}
|
||
|
|
// An [[A5Saver]] is trivially implemented but it simplifies bookkeeping.
|
||
|
|
//
|
||
|
|
// <Inline member functions for file GUSIContext>=
|
||
|
|
inline GUSIProcess::A5Saver::A5Saver(long processA5)
|
||
|
|
{ fSavedA5 = SetA5(processA5); }
|
||
|
|
inline GUSIProcess::A5Saver::A5Saver(GUSIProcess * process)
|
||
|
|
{ fSavedA5 = SetA5(process->GetA5()); }
|
||
|
|
inline GUSIProcess::A5Saver::A5Saver(GUSIContext * context)
|
||
|
|
{ fSavedA5 = SetA5(context->Process()->GetA5()); }
|
||
|
|
inline GUSIProcess::A5Saver::~A5Saver()
|
||
|
|
{ SetA5(fSavedA5); }
|
||
|
|
|
||
|
|
#endif /* GUSI_SOURCE */
|
||
|
|
|
||
|
|
#endif /* _GUSIContext_ */
|