540 lines
14 KiB
C
540 lines
14 KiB
C
/*
|
|
* Copyright (c) 2005, Swedish Institute of Computer Science
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the Institute nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* This file is part of the Contiki operating system.
|
|
*
|
|
*/
|
|
|
|
/**
|
|
* \addtogroup sys
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \defgroup process Contiki processes
|
|
*
|
|
* A process in Contiki consists of a single \ref pt "protothread".
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \file
|
|
* Header file for the Contiki process interface.
|
|
* \author
|
|
* Adam Dunkels <adam@sics.se>
|
|
*
|
|
*/
|
|
|
|
#ifndef PROCESS_H_
|
|
#define PROCESS_H_
|
|
|
|
#include "sys/pt.h"
|
|
#include "sys/cc.h"
|
|
|
|
struct net_buf;
|
|
|
|
typedef unsigned char process_event_t;
|
|
typedef void * process_data_t;
|
|
typedef unsigned char process_num_events_t;
|
|
|
|
/**
|
|
* \name Return values
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \brief Return value indicating that an operation was successful.
|
|
*
|
|
* This value is returned to indicate that an operation
|
|
* was successful.
|
|
*/
|
|
#define PROCESS_ERR_OK 0
|
|
/**
|
|
* \brief Return value indicating that the event queue was full.
|
|
*
|
|
* This value is returned from process_post() to indicate
|
|
* that the event queue was full and that an event could
|
|
* not be posted.
|
|
*/
|
|
#define PROCESS_ERR_FULL 1
|
|
/* @} */
|
|
|
|
#define PROCESS_NONE NULL
|
|
|
|
#ifndef PROCESS_CONF_NUMEVENTS
|
|
#define PROCESS_CONF_NUMEVENTS 32
|
|
#endif /* PROCESS_CONF_NUMEVENTS */
|
|
|
|
#define PROCESS_EVENT_NONE 0x80
|
|
#define PROCESS_EVENT_INIT 0x81
|
|
#define PROCESS_EVENT_POLL 0x82
|
|
#define PROCESS_EVENT_EXIT 0x83
|
|
#define PROCESS_EVENT_SERVICE_REMOVED 0x84
|
|
#define PROCESS_EVENT_CONTINUE 0x85
|
|
#define PROCESS_EVENT_MSG 0x86
|
|
#define PROCESS_EVENT_EXITED 0x87
|
|
#define PROCESS_EVENT_TIMER 0x88
|
|
#define PROCESS_EVENT_COM 0x89
|
|
#define PROCESS_EVENT_MAX 0x8a
|
|
|
|
#define PROCESS_BROADCAST NULL
|
|
#define PROCESS_ZOMBIE ((struct process *)0x1)
|
|
|
|
/**
|
|
* \name Process protothread functions
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Define the beginning of a process.
|
|
*
|
|
* This macro defines the beginning of a process, and must always
|
|
* appear in a PROCESS_THREAD() definition. The PROCESS_END() macro
|
|
* must come at the end of the process.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_BEGIN() PT_BEGIN(process_pt)
|
|
|
|
/**
|
|
* Define the end of a process.
|
|
*
|
|
* This macro defines the end of a process. It must appear in a
|
|
* PROCESS_THREAD() definition and must always be included. The
|
|
* process exits when the PROCESS_END() macro is reached.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_END() PT_END(process_pt)
|
|
|
|
/**
|
|
* Wait for an event to be posted to the process.
|
|
*
|
|
* This macro blocks the currently running process until the process
|
|
* receives an event.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_WAIT_EVENT() PROCESS_YIELD()
|
|
|
|
/**
|
|
* Wait for an event to be posted to the process, with an extra
|
|
* condition.
|
|
*
|
|
* This macro is similar to PROCESS_WAIT_EVENT() in that it blocks the
|
|
* currently running process until the process receives an event. But
|
|
* PROCESS_WAIT_EVENT_UNTIL() takes an extra condition which must be
|
|
* true for the process to continue.
|
|
*
|
|
* \param c The condition that must be true for the process to continue.
|
|
* \sa PT_WAIT_UNTIL()
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_WAIT_EVENT_UNTIL(c) PROCESS_YIELD_UNTIL(c)
|
|
|
|
/**
|
|
* Yield the currently running process.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_YIELD() PT_YIELD(process_pt)
|
|
|
|
/**
|
|
* Yield the currently running process until a condition occurs.
|
|
*
|
|
* This macro is different from PROCESS_WAIT_UNTIL() in that
|
|
* PROCESS_YIELD_UNTIL() is guaranteed to always yield at least
|
|
* once. This ensures that the process does not end up in an infinite
|
|
* loop and monopolizing the CPU.
|
|
*
|
|
* \param c The condition to wait for.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_YIELD_UNTIL(c) PT_YIELD_UNTIL(process_pt, c)
|
|
|
|
/**
|
|
* Wait for a condition to occur.
|
|
*
|
|
* This macro does not guarantee that the process yields, and should
|
|
* therefore be used with care. In most cases, PROCESS_WAIT_EVENT(),
|
|
* PROCESS_WAIT_EVENT_UNTIL(), PROCESS_YIELD() or
|
|
* PROCESS_YIELD_UNTIL() should be used instead.
|
|
*
|
|
* \param c The condition to wait for.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_WAIT_UNTIL(c) PT_WAIT_UNTIL(process_pt, c)
|
|
#define PROCESS_WAIT_WHILE(c) PT_WAIT_WHILE(process_pt, c)
|
|
|
|
/**
|
|
* Exit the currently running process.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_EXIT() PT_EXIT(process_pt)
|
|
|
|
/**
|
|
* Spawn a protothread from the process.
|
|
*
|
|
* \param pt The protothread state (struct pt) for the new protothread
|
|
* \param thread The call to the protothread function.
|
|
* \sa PT_SPAWN()
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_PT_SPAWN(pt, thread) PT_SPAWN(process_pt, pt, thread)
|
|
|
|
/**
|
|
* Yield the process for a short while.
|
|
*
|
|
* This macro yields the currently running process for a short while,
|
|
* thus letting other processes run before the process continues.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_PAUSE() do { \
|
|
process_post(PROCESS_CURRENT(), PROCESS_EVENT_CONTINUE, NULL); \
|
|
PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_CONTINUE); \
|
|
} while(0)
|
|
|
|
/** @} end of protothread functions */
|
|
|
|
/**
|
|
* \name Poll and exit handlers
|
|
* @{
|
|
*/
|
|
/**
|
|
* Specify an action when a process is polled.
|
|
*
|
|
* \note This declaration must come immediately before the
|
|
* PROCESS_BEGIN() macro.
|
|
*
|
|
* \param handler The action to be performed.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_POLLHANDLER(handler) if(ev == PROCESS_EVENT_POLL) { handler; }
|
|
|
|
/**
|
|
* Specify an action when a process exits.
|
|
*
|
|
* \note This declaration must come immediately before the
|
|
* PROCESS_BEGIN() macro.
|
|
*
|
|
* \param handler The action to be performed.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_EXITHANDLER(handler) if(ev == PROCESS_EVENT_EXIT) { handler; }
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* \name Process declaration and definition
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Define the body of a process.
|
|
*
|
|
* This macro is used to define the body (protothread) of a
|
|
* process. The process is called whenever an event occurs in the
|
|
* system, A process always start with the PROCESS_BEGIN() macro and
|
|
* end with the PROCESS_END() macro.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_THREAD(name, ev, data, buf, user_data) \
|
|
static PT_THREAD(process_thread_##name(struct pt *process_pt, \
|
|
process_event_t ev, \
|
|
process_data_t data, \
|
|
struct net_buf *buf, \
|
|
void *user_data))
|
|
|
|
/**
|
|
* Declare the name of a process.
|
|
*
|
|
* This macro is typically used in header files to declare the name of
|
|
* a process that is implemented in the C file.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_NAME(name) extern struct process name
|
|
|
|
/**
|
|
* Declare a process.
|
|
*
|
|
* This macro declares a process. The process has two names: the
|
|
* variable of the process structure, which is used by the C program,
|
|
* and a human readable string name, which is used when debugging.
|
|
* A configuration option allows removal of the readable name to save RAM.
|
|
*
|
|
* \param name The variable name of the process structure.
|
|
* \param strname The string representation of the process' name.
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#if PROCESS_CONF_NO_PROCESS_NAMES
|
|
#define PROCESS(name, strname) \
|
|
PROCESS_THREAD(name, ev, data); \
|
|
struct process name = { NULL, \
|
|
process_thread_##name }
|
|
#else
|
|
#define PROCESS(name, strname) \
|
|
PROCESS_THREAD(name, ev, data, buf, user_data); \
|
|
struct process name = { NULL, strname, \
|
|
process_thread_##name }
|
|
#endif
|
|
|
|
/** @} */
|
|
|
|
struct process {
|
|
struct process *next;
|
|
#if PROCESS_CONF_NO_PROCESS_NAMES
|
|
#define PROCESS_NAME_STRING(process) ""
|
|
#else
|
|
const char *name;
|
|
#define PROCESS_NAME_STRING(process) (process)->name
|
|
#endif
|
|
PT_THREAD((* thread)(struct pt *, process_event_t, process_data_t,
|
|
struct net_buf *, void *user_data));
|
|
struct pt pt;
|
|
unsigned char state, needspoll;
|
|
void *user_data;
|
|
};
|
|
|
|
/**
|
|
* \name Functions called from application programs
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Start a process.
|
|
*
|
|
* \param p A pointer to a process structure.
|
|
*
|
|
* \param data An argument pointer that can be passed to the new
|
|
* process
|
|
*
|
|
*/
|
|
CCIF void process_start(struct process *p, process_data_t data, void *user_data);
|
|
|
|
/**
|
|
* Post an asynchronous event.
|
|
*
|
|
* This function posts an asynchronous event to one or more
|
|
* processes. The handing of the event is deferred until the target
|
|
* process is scheduled by the kernel. An event can be broadcast to
|
|
* all processes, in which case all processes in the system will be
|
|
* scheduled to handle the event.
|
|
*
|
|
* \param ev The event to be posted.
|
|
*
|
|
* \param data The auxiliary data to be sent with the event
|
|
*
|
|
* \param p The process to which the event should be posted, or
|
|
* PROCESS_BROADCAST if the event should be posted to all processes.
|
|
*
|
|
* \retval PROCESS_ERR_OK The event could be posted.
|
|
*
|
|
* \retval PROCESS_ERR_FULL The event queue was full and the event could
|
|
* not be posted.
|
|
*/
|
|
CCIF int process_post(struct process *p, process_event_t ev, process_data_t data);
|
|
|
|
/**
|
|
* Post a synchronous event to a process.
|
|
*
|
|
* \param p A pointer to the process' process structure.
|
|
*
|
|
* \param ev The event to be posted.
|
|
*
|
|
* \param data A pointer to additional data that is posted together
|
|
* with the event.
|
|
*/
|
|
CCIF void process_post_synch(struct process *p,
|
|
process_event_t ev, process_data_t data,
|
|
struct net_buf *buf);
|
|
|
|
/**
|
|
* \brief Cause a process to exit
|
|
* \param p The process that is to be exited
|
|
*
|
|
* This function causes a process to exit. The process can
|
|
* either be the currently executing process, or another
|
|
* process that is currently running.
|
|
*
|
|
* \sa PROCESS_CURRENT()
|
|
*/
|
|
CCIF void process_exit(struct process *p);
|
|
|
|
|
|
/**
|
|
* Get a pointer to the currently running process.
|
|
*
|
|
* This macro get a pointer to the currently running
|
|
* process. Typically, this macro is used to post an event to the
|
|
* current process with process_post().
|
|
*
|
|
* \hideinitializer
|
|
*/
|
|
#define PROCESS_CURRENT() process_current
|
|
CCIF extern struct process *process_current;
|
|
|
|
/**
|
|
* Switch context to another process
|
|
*
|
|
* This function switch context to the specified process and executes
|
|
* the code as if run by that process. Typical use of this function is
|
|
* to switch context in services, called by other processes. Each
|
|
* PROCESS_CONTEXT_BEGIN() must be followed by the
|
|
* PROCESS_CONTEXT_END() macro to end the context switch.
|
|
*
|
|
* Example:
|
|
\code
|
|
PROCESS_CONTEXT_BEGIN(&test_process);
|
|
etimer_set(&timer, CLOCK_SECOND);
|
|
PROCESS_CONTEXT_END(&test_process);
|
|
\endcode
|
|
*
|
|
* \param p The process to use as context
|
|
*
|
|
* \sa PROCESS_CONTEXT_END()
|
|
* \sa PROCESS_CURRENT()
|
|
*/
|
|
#define PROCESS_CONTEXT_BEGIN(p) {\
|
|
struct process *tmp_current = PROCESS_CURRENT();\
|
|
process_current = p
|
|
|
|
/**
|
|
* End a context switch
|
|
*
|
|
* This function ends a context switch and changes back to the
|
|
* previous process.
|
|
*
|
|
* \param p The process used in the context switch
|
|
*
|
|
* \sa PROCESS_CONTEXT_START()
|
|
*/
|
|
#define PROCESS_CONTEXT_END(p) process_current = tmp_current; }
|
|
|
|
/**
|
|
* \brief Allocate a global event number.
|
|
* \return The allocated event number
|
|
*
|
|
* In Contiki, event numbers above 128 are global and may
|
|
* be posted from one process to another. This function
|
|
* allocates one such event number.
|
|
*
|
|
* \note There currently is no way to deallocate an allocated event
|
|
* number.
|
|
*/
|
|
CCIF process_event_t process_alloc_event(void);
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* \name Functions called from device drivers
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* Request a process to be polled.
|
|
*
|
|
* This function typically is called from an interrupt handler to
|
|
* cause a process to be polled.
|
|
*
|
|
* \param p A pointer to the process' process structure.
|
|
*/
|
|
CCIF void process_poll(struct process *p);
|
|
|
|
/** @} */
|
|
|
|
/**
|
|
* \name Functions called by the system and boot-up code
|
|
* @{
|
|
*/
|
|
|
|
/**
|
|
* \brief Initialize the process module.
|
|
*
|
|
* This function initializes the process module and should
|
|
* be called by the system boot-up code.
|
|
*/
|
|
void process_init(void);
|
|
|
|
/**
|
|
* Run the system once - call poll handlers and process one event.
|
|
*
|
|
* This function should be called repeatedly from the main() program
|
|
* to actually run the Contiki system. It calls the necessary poll
|
|
* handlers, and processes one event. The function returns the number
|
|
* of events that are waiting in the event queue so that the caller
|
|
* may choose to put the CPU to sleep when there are no pending
|
|
* events.
|
|
*
|
|
* \return The number of events that are currently waiting in the
|
|
* event queue.
|
|
*/
|
|
int process_run(struct net_buf *buf);
|
|
|
|
|
|
/**
|
|
* Check if a process is running.
|
|
*
|
|
* This function checks if a specific process is running.
|
|
*
|
|
* \param p The process.
|
|
* \retval Non-zero if the process is running.
|
|
* \retval Zero if the process is not running.
|
|
*/
|
|
CCIF int process_is_running(struct process *p);
|
|
|
|
/**
|
|
* Number of events waiting to be processed.
|
|
*
|
|
* \return The number of events that are currently waiting to be
|
|
* processed.
|
|
*/
|
|
int process_nevents(void);
|
|
|
|
/** @} */
|
|
|
|
CCIF extern struct process *process_list;
|
|
|
|
#define PROCESS_LIST() process_list
|
|
|
|
#endif /* PROCESS_H_ */
|
|
|
|
/** @} */
|
|
/** @} */
|