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56cafb3b57
There was a race when the component entrypoint wanted to do 'wait_and_dispatch_one_signal'. In this function it raises a flag for the signal proxy thread to notice that the entrypoint also wants to block for signals. When the flag is set and the signal proxy wakes up with a new signal, it tried to cancel the blocking of the entrypoint. However, if the entrypoint had not reached the signal blocking at this point, the cancel blocking failed without a solution. Now, the new Kernel::cancel_next_signal_blocking call solves the problem by storing a request to cancel the next signal blocking of a thread immediately without blocking itself. Ref #2284
363 lines
11 KiB
C++
363 lines
11 KiB
C++
/*
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* \brief Interface between kernel and userland
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* \author Martin stein
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* \date 2011-11-30
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*/
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/*
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* Copyright (C) 2011-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__KERNEL__INTERFACE_H_
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#define _INCLUDE__KERNEL__INTERFACE_H_
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/* base-hw includes */
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#include <kernel/types.h>
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#include <kernel/interface_support.h>
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namespace Kernel
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{
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/**
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* Kernel names of the kernel calls
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*/
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constexpr Call_arg call_id_stop_thread() { return 0; }
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constexpr Call_arg call_id_restart_thread() { return 1; }
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constexpr Call_arg call_id_yield_thread() { return 2; }
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constexpr Call_arg call_id_send_request_msg() { return 3; }
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constexpr Call_arg call_id_send_reply_msg() { return 4; }
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constexpr Call_arg call_id_await_request_msg() { return 5; }
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constexpr Call_arg call_id_kill_signal_context() { return 6; }
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constexpr Call_arg call_id_submit_signal() { return 7; }
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constexpr Call_arg call_id_await_signal() { return 8; }
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constexpr Call_arg call_id_cancel_next_await_signal() { return 9; }
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constexpr Call_arg call_id_ack_signal() { return 10; }
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constexpr Call_arg call_id_print_char() { return 11; }
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constexpr Call_arg call_id_update_data_region() { return 12; }
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constexpr Call_arg call_id_update_instr_region() { return 13; }
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constexpr Call_arg call_id_ack_cap() { return 14; }
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constexpr Call_arg call_id_delete_cap() { return 15; }
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constexpr Call_arg call_id_timeout() { return 16; }
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constexpr Call_arg call_id_timeout_age_us() { return 17; }
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constexpr Call_arg call_id_timeout_max_us() { return 18; }
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/*****************************************************************
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** Kernel call with 1 to 6 arguments **
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** **
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** These functions must not be inline to ensure that objects, **
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** wich are referenced by arguments, are tagged as "used" even **
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** though only the pointer gets handled in here. **
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*****************************************************************/
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Call_ret call(Call_arg arg_0);
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Call_ret call(Call_arg arg_0,
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Call_arg arg_1);
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Call_ret call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2);
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Call_ret call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2,
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Call_arg arg_3);
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Call_ret call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2,
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Call_arg arg_3,
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Call_arg arg_4);
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Call_ret call(Call_arg arg_0,
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Call_arg arg_1,
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Call_arg arg_2,
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Call_arg arg_3,
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Call_arg arg_4,
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Call_arg arg_5);
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/**
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* Install timeout for calling thread
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*
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* \param duration_us timeout duration in microseconds
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* \param sigid local name of signal context to trigger
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*
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* This call always overwrites the last timeout installed by the thread
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* if any.
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*/
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inline int timeout(time_t const duration_us, capid_t const sigid)
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{
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return call(call_id_timeout(), duration_us, sigid);
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}
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/**
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* Return time in microseconds since the caller installed its last timeout
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*
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* Must not be called if the installation is older than 'timeout_max_us'.
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*/
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inline time_t timeout_age_us()
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{
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return call(call_id_timeout_age_us());
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}
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/**
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* Return the constant maximum installable timeout in microseconds
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*
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* The return value is also the maximum delay to call 'timeout_age_us'
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* for a timeout after its installation.
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*/
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inline time_t timeout_max_us()
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{
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return call(call_id_timeout_max_us());
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}
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/**
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* Wait for a user event signaled by a 'restart_thread' syscall
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*
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* The stop syscall always targets the calling thread that, therefore must
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* be in the 'active' thread state. The thread then switches to the
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* 'stopped' thread state in wich it waits for a restart. The restart
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* syscall can only be used on a thread in the 'stopped' or the 'active'
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* thread state. The thread then switches back to the 'active' thread
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* state and the syscall returns whether the thread was stopped. Both
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* syscalls are not core-restricted. In contrast to the 'stop' syscall,
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* 'restart' may target any thread in the same PD as the caller. Thread
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* state and UTCB content of a thread don't change while in the 'stopped'
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* state. The 'stop/restart' feature is used when an active thread wants
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* to wait for an event that is not known to the kernel. Actually, the
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* syscalls are used when waiting for locks and when doing infinite
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* waiting on thread exit.
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*/
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inline void stop_thread()
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{
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call(call_id_stop_thread());
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}
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/**
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* End blocking of a stopped thread
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*
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* \param thread_id capability id of the targeted thread
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*
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* \return wether the thread was stopped beforehand
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*
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* For details see the 'stop_thread' syscall.
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*/
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inline bool restart_thread(capid_t const thread_id)
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{
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return call(call_id_restart_thread(), thread_id);
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}
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/**
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* Yield the callers remaining CPU time for this super period
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*
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* Does its best that the caller is scheduled as few as possible in the
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* current scheduling super-period without touching the thread or pause
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* state of the thread. In the next superperiod, however, the thread is
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* scheduled 'normal' again. The syscall is not core-restricted and always
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* targets the caller. It is actually used in locks to help another thread
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* reach a desired point in execution by releasing pressure from the CPU.
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*/
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inline void yield_thread()
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{
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call(call_id_yield_thread());
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}
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/**
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* Globally apply writes to a data region in the current domain
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*
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* \param base base of the region within the current domain
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* \param size size of the region
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*/
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inline void update_data_region(addr_t const base, size_t const size)
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{
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call(call_id_update_data_region(), (Call_arg)base, (Call_arg)size);
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}
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/**
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* Globally apply writes to an instruction region in the current domain
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*
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* \param base base of the region within the current domain
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* \param size size of the region
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*/
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inline void update_instr_region(addr_t const base, size_t const size)
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{
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call(call_id_update_instr_region(), (Call_arg)base, (Call_arg)size);
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}
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/**
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* Send request message and await receipt of corresponding reply message
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*
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* \param thread_id capability id of targeted thread
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*
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* \retval 0 succeeded
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* \retval -1 failed
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* \retval -2 failed due to out-of-memory for capability reception
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*
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* If the call returns successful, the received message is located at the
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* base of the callers userland thread-context.
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*/
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inline int send_request_msg(capid_t const thread_id, unsigned rcv_caps)
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{
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return call(call_id_send_request_msg(), thread_id, rcv_caps);
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}
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/**
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* Await receipt of request message
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*
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* \param rcv_caps number of capabilities willing to accept
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*
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* \retval 0 succeeded
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* \retval -1 canceled
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* \retval -2 failed due to out-of-memory for capability reception
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*
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* If the call returns successful, the received message is located at the
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* base of the callers userland thread-context.
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*/
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inline int await_request_msg(unsigned rcv_caps)
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{
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return call(call_id_await_request_msg(), rcv_caps);
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}
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/**
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* Reply to lastly received request message
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*
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* \param rcv_caps number of capabilities to accept when awaiting again
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* \param await_request_msg wether the call shall await a request message
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*
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* \retval 0 await_request_msg == 0 or request-message receipt succeeded
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* \retval -1 await_request_msg == 1 and request-message receipt failed
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*
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* If the call returns successful and await_request_msg == 1, the received
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* message is located at the base of the callers userland thread-context.
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*/
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inline int send_reply_msg(unsigned rcv_caps, bool const await_request_msg)
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{
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return call(call_id_send_reply_msg(), rcv_caps, await_request_msg);
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}
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/**
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* Print a char c to the kernels serial ouput
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*
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* If c is set to 0 the kernel prints a table of all threads and their
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* current activities to the serial output.
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*/
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inline void print_char(char const c)
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{
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call(call_id_print_char(), c);
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}
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/**
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* Await any context of a receiver and optionally ack a context before
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*
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* \param receiver_id capability id of the targeted signal receiver
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*
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* \retval 0 suceeded
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* \retval -1 failed
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*
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* If this call returns 0, an instance of 'Signal::Data' is located at the
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* base of the callers UTCB. Every occurence of a signal is provided
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* through this function until it gets delivered through this function or
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* context respectively receiver get destructed. If multiple threads
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* listen at the same receiver, and/or multiple contexts of the receiver
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* trigger simultanously, there is no assertion about wich thread
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* receives, and from wich context. A context that delivered once doesn't
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* deliver again unless its last delivery has been acknowledged via
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* ack_signal.
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*/
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inline int await_signal(capid_t const receiver_id)
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{
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return call(call_id_await_signal(), receiver_id);
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}
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/**
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* Request to cancel the next signal blocking of a local thread
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*
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* \param thread_id capability id of the targeted thread
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*
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* Does not block. Targeted thread must be in the same PD as the caller.
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* If the targeted thread is in a signal blocking, cancels the blocking
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* directly. Otherwise, stores the request and avoids the next signal
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* blocking of the targeted thread as if it was immediately cancelled.
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* If the target thread already holds a request, further ones get ignored.
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*/
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inline void cancel_next_await_signal(capid_t const thread_id)
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{
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call(call_id_cancel_next_await_signal(), thread_id);
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}
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/**
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* Trigger a specific signal context
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*
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* \param context capability id of the targeted signal context
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* \param num how often the context shall be triggered by this call
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*
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* \retval 0 suceeded
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* \retval -1 failed
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*/
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inline int submit_signal(capid_t const context, unsigned const num)
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{
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return call(call_id_submit_signal(), context, num);
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}
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/**
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* Acknowledge the processing of the last delivery of a signal context
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*
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* \param context capability id of the targeted signal context
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*/
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inline void ack_signal(capid_t const context)
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{
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call(call_id_ack_signal(), context);
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}
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/**
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* Halt processing of a signal context synchronously
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*
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* \param context capability id of the targeted signal context
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*
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* \retval 0 suceeded
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* \retval -1 failed
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*/
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inline int kill_signal_context(capid_t const context)
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{
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return call(call_id_kill_signal_context(), context);
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}
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/**
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* Acknowledge reception of a capability
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*
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* \param cap capability id to acknowledge
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*/
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inline void ack_cap(capid_t const cap)
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{
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call(call_id_ack_cap(), cap);
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}
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/**
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* Delete a capability id
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*
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* \param cap capability id to delete
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*/
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inline void delete_cap(capid_t const cap)
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{
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call(call_id_delete_cap(), cap);
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}
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}
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#endif /* _INCLUDE__KERNEL__INTERFACE_H_ */
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