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When capabilities are delegated to components, they are added to the UTCB of the target thread. Before the thread is able to take out the capability id out of the UTCB and adapt the user-level capability reference counter, it might happen that another thread of the same component deletes the same capability because its user-level reference counter reached zero. If the kernel then destroys the capability, before the same capability id is taken out of all UTCBs, an inconsitent view in the component is the result. To keep an consistent view in the multi-threading scenario, the kernel now counts how often it puts a capability into a UTCB. The threads on the other hand hint the kernel when they took capabilities out of the UTCB, so the kernel can decrement the counter again. Only when the counter is zero, capabilities can get destructed. Fix #1623
292 lines
8.2 KiB
C++
292 lines
8.2 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) 2011-2013 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 General Public License version 2.
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*/
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#ifndef _KERNEL__INTERFACE_H_
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#define _KERNEL__INTERFACE_H_
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/* base-hw includes */
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#include <kernel/interface_support.h>
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namespace Kernel
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{
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using addr_t = Genode::addr_t;
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using size_t = Genode::size_t;
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using capid_t = Genode::uint16_t;
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constexpr capid_t cap_id_invalid() { return 0; }
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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_pause_current_thread() { return 0; }
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constexpr Call_arg call_id_resume_local_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_ack_signal() { return 9; }
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constexpr Call_arg call_id_print_char() { return 10; }
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constexpr Call_arg call_id_update_data_region() { return 11; }
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constexpr Call_arg call_id_update_instr_region() { return 12; }
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constexpr Call_arg call_id_ack_cap() { return 13; }
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constexpr Call_arg call_id_delete_cap() { return 14; }
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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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* Pause execution of calling thread
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*/
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inline void pause_current_thread()
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{
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call(call_id_pause_current_thread());
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}
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/**
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* Cancel blocking of a thread of the current domain if possible
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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 thread was in a cancelable blocking beforehand
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*/
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inline bool resume_local_thread(capid_t const thread_id)
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{
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return call(call_id_resume_local_thread(), thread_id);
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}
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/**
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* Let the current thread give up its remaining timeslice
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*
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* \param thread_id capability id of the benefited thread
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*
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* If thread_id is valid the call will resume the targeted thread
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* additionally.
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*/
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inline void yield_thread(capid_t const thread_id)
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{
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call(call_id_yield_thread(), thread_id);
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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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* 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 /* _KERNEL__INTERFACE_H_ */
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