changelog

eCos操作系统源码

	* include/kapi.h (cyg_protcol): Define new emumeration for mutex
	priority protocol setting, and headers for the new function to set
	it.

2001-08-03  Nick Garnett  <[e-mail]>

	Imported from a development branch:
	
	2001-07-11  Nick Garnett  <[e-mail]>

		* src/sched/mlqueue.cxx: Changed behaviour of
		set_need_reschedule() to a better implementation of the intended
		algorithm.

		* include/kapi.h: 
		* src/common/kapi.cxx:
		Added API for controlling routing of interrupts to CPUs in SMP
		configurations.

	2001-07-03  Nick Garnett  <[e-mail]>

		* cdl/scheduler.cdl:
		* include/bitmap.hxx:
		* src/sched/bitmap.cxx:
		Fixed up bitmap scheduler so it still works within the
		SMP-modified scheduling infrastructure. The bitmap scheduler
		is not currently SMP-enabled, only single CPU configurations are
		supported - hence the CDL change to require this.

	2001-06-29  Nick Garnett  <[e-mail]>

		* src/sched/sched.cxx:
		Removed the call to Cyg_Interrupt::enable_interrupts() in
		Cyg_Scheduler::start_cpu(). This was a relic from the days when
		the interrupt enable state was not part of the thread state. Now
		it is, and loading the first thread will cause interrupts to be
		enabled.

		* src/intr/intr.cxx:
		Changed initial values of Cyg_Interrupt::disable_counter[]s to
		zero as a result of the change in Cyg_Scheduler::start_cpu().

		* include/kapi.h:
		* include/kapidata.h:
		* src/common/kapi.cxx: 
		Added API for using spinlocks. Largely so that it may be extended
		to the driver API.

		* include/mlqueue.hxx:
		* include/intr.hxx:
		* include/sched.hxx:
		Added annotations to various static variables.

	2001-06-28  Nick Garnett  <[e-mail]>

		* include/intr.hxx:
		* src/intr/intr.cxx:
		Changed behaviour of Cyg_Interrupt::disable_interrupts() and
		Cyg_Interrupt::enable_interrupts(). These now claim and release a
		spinlock in addition to disabling and enabling interrupts. The
		original interrupt state is also preserved and restored. This is
		necessary in SMP systems to allow drivers etc. to correctly
		synchronize with threads and DSRs that may be running on different
		CPUs. In the single CPU case this mechanism reduces to the
		original simple interrupt disable code.
		[Later change] Backed off addition of volatile modifier to
		interrupt_disable_state.

		* include/smp.hxx: Some minor tidies.

	2001-06-27  Nick Garnett  <[e-mail]>

		* tests/release.cxx: Added spin loop in thread1 to allow thread0
		to execute its wait. This is necessary in SMP systems where the
		threads will execute in parallel, but is also benign in single CPU
		systems.

		* tests/mutex2.cxx:
		* tests/mutex3.cxx:
		* tests/sync3.cxx: 
		* tests/thread2.cxx: 
		These tests depend on predicting the behaviour of threads at
		different priorities to pass. In an SMP system, several threads
		will run in parallel, and the execution order will not be as
		expected. These tests are therefore disabled in SMP
		configurations.

		* src/sched/mlqueue.cxx (add_thread): Moved call to
		set_need_reschedule() out of test for empty queue. In SMP systems,
		any addition to a queue may require a reschedule on another CPU.

	2001-06-22  Nick Garnett  <[e-mail]>

		* include/mlqueue.hxx:
		* src/sched/mlqueue.cxx:
		A major change to the way in which this scheduler works in SMP
		systems. The previous version removed all runnable threads from
		the run queues when they were executing. This resulted in serious
		complications and messy code, particularly when dealing with
		priority changes and timeslicing. The new version keeps running
		threads in the run queues, just like the single-CPU version. The
		main disadvantage of this is that we may have to search past
		threads running on other CPUs before we find one available to run
		on this CPU. However, the pending count array and map mean that we
		only need search one run queue, and in any case the search remains
		bounded by the number of CPUs available.
		Another change is in the way that timeslicing is handled. Now, the
		CPU that takes the clock interrupt decrements the timeslice counts
		for all CPUs and if any go zero, sends a TIMESLICE message to
		that CPU.

		* src/sched/sched.cxx (unlock_inner):
		Removed call to requeue(), no longer needed as a result of
		scheduler reorganization.

		* src/common/thread.cxx:
		Added test in Cyg_Thread::exit() to check that the thread has not
		already been killed. This is only an issue if the thread is
		calling exit() when it is kill()ed from another CPU. The test is
		redundant in single-CPU systems, but it does no harm having it.
		Added code to Cyg_Thread::set_priority() to check for reschedule
		when another thread is being changed in priority.
		Added call in idle thread constructor to scheduler to install the
		idle thread as the default current thread for a CPU.

		* include/smp.hxx:
		Added CYG_KERNEL_CPU_TIMESLICE_INTERRUPT(), did some miscellaneous
		tidying.

		* include/instrmnt.h: Added SMP_RESCHED_SEND and SMP_RESCHED_RECV
		events.

		* cdl/kernel.cdl: Added smp test program.

		* tests/smp.cxx: Added this program to test SMP functionality.

	2001-06-13  Nick Garnett  <[e-mail]>

		* src/sched/sched.cxx:
		Removed code to set up initial current thread, this is now done
		in the idle thread constructor.
		Added code here to set up interrupts for SMP inter-processor
		interrupts. This is not very tidy and may need to be
		changed in the future.

		* src/sched/mlqueue.cxx:
		Added local set_need_reschedule() function to set the
		need_reschedule flag on a suitable CPU.
		Many more changes to cope with SMP systems.
		NOTE: This code has all become somthing of a mess, it need to be
		tidied up and the SMP-specific changes integrated better into the
		code. Also, timesliceing currently only works on the CPU that
		takes clock interrupts - this needs fixing.

		* src/common/thread.cxx:
		Moved assignment of initial current thread to here from sched.cxx.

		* include/smp.hxx:
		Changed CYG_KERNEL_CPU_INTERRUPT()
		CYG_KERNEL_CPU_RESCHEDULE_INTERRUPT() since there may be other
		interrupt types to worry about.
		Added annotations to scheduler data items.

		* include/sched.hxx:
		Split set_current_thread() into two functions, the original works
		only on the current CPU, the new one sets another CPU's current
		thread. This latter function is only used to prime the current
		threads during initialization.
		Added second need_reschedule() function that takes a thread
		argument. This is intended to be overridden by a scheduler
		specific function that sets the need_reschedule flag if the
		supplied thread is more deserving of CPU time that any current
		thread.

		* include/mlqueue.hxx:
		Made cyg_scheduler_set_need_reschedule() a friend of
		Cyg_Scheduler_Implementation class.
		Added override set_need_reschedule() functions.

		* include/kapidata.h: Added cpu field to cyg_thread structure when
		in SMP systems.

		* include/intr.hxx:
		* src/intr/intr.cxx:
		Added Cyg_Interrupt::set_cpu() and Cyg_Interrupt::get_cpu() for
		SMP systems.

		* include/instrmnt.h: Added events for INTR_GET_CPU and
		INTR_SET_CPU.

	2001-05-29  Nick Garnett  <[e-mail]>

		The following changes were all imported from the SMP branch:

		* tests/tm_basic.cxx:
		Modified to work in SMP configuration - mostly at present by
		ifdeffing out code I didn't want to fix.

		* include/sched.hxx:
		Moved scheduler lock operation into Cyg_Scheduler_SchedLock class.
		Converted current_thread, need_reschedule, and thread_switches
		into CPU indexed arrays. Added member functions to get and set
		these indirectly.
		Added start_cpu() to do per-CPU scheduler startup.

		* include/sched.inl:
		Converted scheduler lock/unlock functions to use new schedlock
		class.

		* src/sched/sched.cxx:
		Changed in line with sched.hxx.
		Added call to requeue() in unlock_inner() to restore current
		thread to run queue if necessary.	
		Moved most of scheduler startup to Cyg_Scheduler::start_cpu().
		Cyg_Scheduler::start() now also starts secondary CPUs in SMP
		systems.
		Added cyg_kernel_smp_startup() as entry point from HAL into kernel
		for secondary CPUs.

		* include/mlqueue.hxx:
		Added Cyg_RunQueue type and removed
		Cyg_SchedulerThreadQueue_Implementation type.
		Converted timeslice_count to CPU indexed array.
		Added requeue() member function to scheduler class.
		Added cpu member to thread implementation class, to record
		thread's current CPU.

		* src/sched/mlqueue.cxx:
		Changed behaviour when in SMP system to remove scheduled thread
		from run queue and replace it when preempted.
		Added some extra asserts, and removed some that are no longer true
		in an SMP system.

		* src/instrmnt/meminst.cxx: In SMP systems: added spinlock to
		protect instrument buffer, added CPU Id in top 4 bits of thread Id
		field.

		* src/common/thread.cxx:
		Converted to use accessor functions for need_reschedule and
		current_thread.
		Rearranged idle thread creation to create one for each CPU.

		* include/test/stackmon.h: Extended to handle stack usage for
		multiple idle threads.

		* include/thread.inl:
		Added some extra instrumentation.

		* include/smp.hxx:
		Added this file to contain all kernel SMP support. The main
		definitions exported by this file are spin lock and scheduler lock
		implementation classes, for both SMP and uniprocessor
		configurations.

		* src/intr/intr.cxx: 
		* include/intr.hxx:
		Converted interrupt disable counter to CPU indexed array. In
		intr.cxx: added lock of scheduler lock in interrupt_end() rather
		than in default interrupt VSR.

		* cdl/kernel.cdl: Added option to enable SMP support.

		* include/instrmnt.h: 
		* cdl/instrument.cdl: Added SMP instrumentation.

	2001-05-25  Nick Garnett  <[e-mail]>

		* include/intr.hxx:
		* src/intr/intr.cxx: 
		Added default definition of CYGNUM_HAL_ISR_TABLE_SIZE. This is now
		used to declare the chain table so that architectures which have
		different sizes for the interrupt table and vector count will work
		correctly.

	2001-05-22  Nick Garnett  <[e-mail]>

		* include/sched.hxx (class Cyg_Scheduler_Base):
		Added annotation to sched_lock.

		* cdl/instrument.cdl:
		Rename CYGNUM_KERNEL_INSTRUMENT_BUFFER_WRAP to
		CYGDBG_KERNEL_INSTRUMENT_BUFFER_WRAP as it appears in the code.

2001-07-27  Jesper Skov  <[e-mail]>

	* src/intr/intr.cxx (chain_isr): Return isr_ret so caller (which
	may be an arbiter) can tell if the interrupt was handled.

2001-07-26  Gary Thomas  <[e-mail]>

	* src/common/clock.cxx (dsr): Fix problems mixing signed and
	unsigned values.  Normally only generated warnings, but...

2001-07-09  Jonathan Larmour  <[e-mail]>

	* include/sched.inl (unlock_reschedule): Fix commenting.
	* src/sched/sched.cxx: Improve description of unlock_inner().

2001-06-21  Jonathan Larmour  <[e-mail]>

	* src/common/thread.cxx (Cyg_Thread::Cyg_Thread): Initialize
	wakeup_count

2001-06-06  Hugo Tyson  <[e-mail]>

	* tests/clocktruth.cxx: New file.  A test to get a sanity check on
	whether the clock is accurate to wallclock time, only useful for
	humans to watch really.  But important!

2001-05-31  Jonathan Larmour  <[e-mail]>

	* include/thread.hxx (class Cyg_HardwareThread): Remove unused
	load_context() method.
	* include/thread.inl: Ditto.

2001-05-29  Jonathan Larmour  <[e-mail]>

	* src/sched/bitmap.cxx (rem_thread): No need to set need_reschedule...
	rescheduling will happen automatically when the state changes.

	* src/sched/mlqueue.cxx (add_thread): No need to explicitly clear
	thread->queue.

2001-04-26  Nick Garnett  <[e-mail]>

	* tests/intr0.cxx: 
	* tests/kintr0.c:
	Fixed these two tests so that they work properly on architectures
	where CYGNUM_HAL_ISR_MIN is not zero. These include the x86 and
	V850.

2001-04-18  Bart Veer  <[e-mail]>

	* tests/dhrystone.c:
	Fix the conditional for STDIO_FORMATTED_IO

2001-04-17  Bart Veer  <[e-mail]>

	* tests/stress_threads.c (setup_death_alarm):
	Cope with synthetic target reorg

	* tests/except1.cxx, tests/kexcept1.c:
	Reenable for the synthetic target

	* tests/tm_basic.cxx:
	Reenable for the synthetic target

2001-04-17  Jesper Skov  <[e-mail]>

	* cdl/kernel.cdl: Do cache tests on E7T.

2001-04-05  Nick Garnett  <[e-mail]>

	* tests/flag1.cxx: Apply same changes here as were applied to
	kflag1 on 2000-07-17. This allows this test to run to completion
	in slow targets, especially simulators.

	* tests/stress_threads.c: Reduce run time even further in
	simulator runs where instrumentation is enabled.

2001-04-03  Jesper Skov  <[e-mail]>

	* tests/dhrystone.c: Fix feature check.

2001-03-28  Jonathan Larmour  <[e-mail]>

	* cdl/kernel.cdl: Only need to compile dbg_gdb.cxx with
	CYGDBG_KERNEL_DEBUG_GDB_THREAD_SUPPORT

	* src/debug/dbg_gdb.cxx: Add new dbg_thread_id() function.

2001-02-23  Jonathan Larmour  <[e-mail]>

	* include/thread.inl (attach_stack): Check for non-NULL stack base.

2001-02-11  Jonathan Larmour  <[e-mail]>

	* tests/stress_threads.c: CYGINT_ISO_STDIO_FORMATTED_IO needs a
	#ifdef not an #if.
	* tests/dhrystone.c: Ditto.