420 lines
11 KiB
C
420 lines
11 KiB
C
/*
|
|
* This file is subject to the terms of the GFX License. If a copy of
|
|
* the license was not distributed with this file, you can obtain one at:
|
|
*
|
|
* http://chibios-gfx.com/license.html
|
|
*/
|
|
|
|
/**
|
|
* @file include/gos/gos.h
|
|
* @brief GOS - Operating System Support header file.
|
|
*
|
|
* @addtogroup GOS
|
|
* @brief GOS provides the operating system interface with the GFX library.
|
|
* @note Some of the routines specified below may be implemented simply as
|
|
* a macro to the real operating system call.
|
|
* @{
|
|
*/
|
|
|
|
#ifndef _GOS_H
|
|
#define _GOS_H
|
|
|
|
#if defined(__DOXYGEN__)
|
|
/*===========================================================================*/
|
|
/* Type definitions */
|
|
/*===========================================================================*/
|
|
|
|
/**
|
|
* @brief Various integer sizes
|
|
* @note Your platform may use slightly different definitions to these
|
|
* @{
|
|
*/
|
|
typedef unsigned char bool_t;
|
|
typedef char int8_t;
|
|
typedef unsigned char uint8_t;
|
|
typedef short int16_t;
|
|
typedef unsigned short uint16_t;
|
|
typedef long int32_t;
|
|
typedef unsigned long uint32_t;
|
|
/**
|
|
* @}
|
|
*
|
|
* @brief Various platform (and operating system) dependent types
|
|
* @note Your platform may use slightly different definitions to these
|
|
* @{
|
|
*/
|
|
typedef unsigned long size_t;
|
|
typedef unsigned long delaytime_t;
|
|
typedef unsigned long systemticks_t;
|
|
typedef short semcount_t;
|
|
typedef int threadreturn_t;
|
|
typedef int threadpriority_t;
|
|
|
|
/**
|
|
* @brief Declare a thread stack and function
|
|
* @{
|
|
*/
|
|
#define DECLARE_THREAD_FUNCTION(fnName, param) threadreturn_t fnName(void *param)
|
|
#define DECLARE_THREAD_STACK(name, sz) uint8_t name[sz];
|
|
/* @} */
|
|
|
|
/**
|
|
* @}
|
|
*
|
|
* @brief Various platform (and operating system) constants
|
|
* @note Your platform may use slightly different definitions to these
|
|
* @{
|
|
*/
|
|
#define FALSE 0
|
|
#define TRUE 1
|
|
#define TIME_IMMEDIATE 0
|
|
#define TIME_INFINITE ((delaytime_t)-1)
|
|
#define MAX_SEMAPHORE_COUNT ((semcount_t)(((unsigned long)((semcount_t)(-1))) >> 1))
|
|
#define LOW_PRIORITY 0
|
|
#define NORMAL_PRIORITY 1
|
|
#define HIGH_PRIORITY 2
|
|
/* @} */
|
|
|
|
/**
|
|
* @brief A semaphore
|
|
* @note Your operating system will have a proper definition for this structure
|
|
*/
|
|
typedef struct {} gfxSem;
|
|
|
|
/**
|
|
* @brief A mutex
|
|
* @note Your operating system will have a proper definition for this structure
|
|
*/
|
|
typedef struct {} gfxMutex;
|
|
|
|
/**
|
|
* @brief A thread handle
|
|
* @note Your operating system will have a proper definition for this.
|
|
*/
|
|
typedef void * gfxThreadHandle;
|
|
|
|
/*===========================================================================*/
|
|
/* Function declarations. */
|
|
/*===========================================================================*/
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
/**
|
|
* @brief Halt the GFX application due to an error.
|
|
*
|
|
* @param[in] msg An optional debug message to show (Can be NULL)
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxHalt(const char *msg);
|
|
|
|
/**
|
|
* @brief Exit the GFX application.
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxExit(void);
|
|
|
|
/**
|
|
* @brief Allocate memory
|
|
* @return A pointer to the memory allocated or NULL if there is no more memory available
|
|
*
|
|
* @param[in] sz The size in bytes of the area to allocate
|
|
*
|
|
* @api
|
|
*/
|
|
void *gfxAlloc(size_t sz);
|
|
|
|
/**
|
|
* @brief Free memory
|
|
*
|
|
* @param[in] ptr The memory to free
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxFree(void *ptr);
|
|
|
|
/**
|
|
* @brief Yield the current thread
|
|
* @details Give up the rest of the current time slice for this thread in order to give other threads
|
|
* a chance to run.
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxYield(void);
|
|
|
|
/**
|
|
* @brief Put the current thread to sleep for the specified period in milliseconds
|
|
*
|
|
* @param[in] ms The number milliseconds to sleep
|
|
*
|
|
* @note Specifying TIME_IMMEDIATE will yield the current thread but return
|
|
* on the next time slice.
|
|
* @note Specifying TIME_INFINITE will sleep forever.
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxSleepMilliseconds(delaytime_t ms);
|
|
|
|
/**
|
|
* @brief Put the current thread to sleep for the specified period in microseconds
|
|
*
|
|
* @param[in] ms The number microseconds to sleep
|
|
*
|
|
* @note Specifying TIME_IMMEDIATE will return immediately (no sleeping)
|
|
* @note Specifying TIME_INFINITE will sleep forever.
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxSleepMicroseconds(delaytime_t ms);
|
|
|
|
/**
|
|
* @brief Get the current operating system tick time
|
|
* @return The current tick time
|
|
*
|
|
* @note A "tick" is an arbitrary period of time that the operating
|
|
* system uses to mark time.
|
|
* @note The absolute value of this call is relatively meaningless. Its usefulness
|
|
* is in calculating periods between two calls to this function.
|
|
* @note As the value from this function can wrap it is important that any periods are calculated
|
|
* as t2 - t1 and then compared to the desired period rather than comparing
|
|
* t1 + period to t2
|
|
*
|
|
* @api
|
|
*/
|
|
systemticks_t gfxSystemTicks(void);
|
|
|
|
/**
|
|
* @brief Convert a given number of millseconds to a number of operating system ticks
|
|
* @return The period in system ticks.
|
|
*
|
|
* @note A "tick" is an arbitrary period of time that the operating
|
|
* system uses to mark time.
|
|
*
|
|
* @param[in] ms The number of millseconds
|
|
*
|
|
* @api
|
|
*/
|
|
systemticks_t gfxMillisecondsToTicks(delaytime_t ms);
|
|
|
|
/**
|
|
* @brief Lock the operating system to protect a sequence of code
|
|
*
|
|
* @note Calling this will lock out all other threads from executing even at interrupt level
|
|
* within the GFX system. On hardware this may be implemented as a disabling of interrupts,
|
|
* however in an operating system which hides real interrupt level code it may simply use a
|
|
* mutex lock.
|
|
* @note The thread MUST NOT block whilst the system is locked. It must execute in this state for
|
|
* as short a period as possible as this can seriously affect interrupt latency on some
|
|
* platforms.
|
|
* @note While locked only interrupt level (iclass) GFX routines may be called.
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxSystemLock(void);
|
|
|
|
/**
|
|
* @brief Unlock the operating system previous locked by gfxSystemLock()
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxSystemUnlock(void);
|
|
|
|
/**
|
|
* @brief Initialise a mutex to protect a region of code from other threads.
|
|
*
|
|
* @param[in] pmutex A pointer to the mutex
|
|
*
|
|
* @note Whilst a counting semaphore with a limit of 1 can be used for similiar purposes
|
|
* on many operating systems using a seperate mutex structure is more efficient.
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxMutexInit(gfxMutex *pmutex);
|
|
|
|
/**
|
|
* @brief Destroy a Mutex.
|
|
*
|
|
* @param[in] pmutex A pointer to the mutex
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxMutexDestroy(gfxMutex *pmutex);
|
|
|
|
/**
|
|
* @brief Enter the critical code region protected by the mutex.
|
|
* @details Blocks until there is no other thread in the critical region.
|
|
*
|
|
* @param[in] pmutex A pointer to the mutex
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxMutexEnter(gfxMutex *pmutex);
|
|
|
|
/**
|
|
* @brief Exit the critical code region protected by the mutex.
|
|
* @details May cause another thread waiting on the mutex to now be placed into the run queue.
|
|
*
|
|
* @param[in] pmutex A pointer to the mutex
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxMutexExit(gfxMutex *pmutex);
|
|
|
|
/**
|
|
* @brief Initialise a Counted Semaphore
|
|
*
|
|
* @param[in] psem A pointer to the semaphore
|
|
* @param[in] val The initial value of the semaphore
|
|
* @param[in] limit The maxmimum value of the semaphore
|
|
*
|
|
* @note Operations defined for counted semaphores:
|
|
* Signal: The semaphore counter is increased and if the result is non-positive then a waiting thread
|
|
* is queued for execution. Note that once the thread reaches "limit", further signals are
|
|
* ignored.
|
|
* Wait: The semaphore counter is decreased and if the result becomes negative the thread is queued
|
|
* in the semaphore and suspended.
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxSemInit(gfxSem *psem, semcount_t val, semcount_t limit);
|
|
|
|
/**
|
|
* @brief Destroy a Counted Semaphore
|
|
*
|
|
* @param[in] psem A pointer to the semaphore
|
|
*
|
|
* @note Any threads waiting on the semaphore will be released
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxSemDestroy(gfxSem *psem);
|
|
|
|
/**
|
|
* @brief Wait on a semaphore
|
|
* @details The semaphore counter is decreased and if the result becomes negative the thread waits for it to become
|
|
* non-negative again
|
|
* @return FALSE if the wait timeout occurred otherwise TRUE
|
|
*
|
|
* @param[in] psem A pointer to the semaphore
|
|
* @param[in] ms The maxmimum time to wait for the semaphore
|
|
*
|
|
* @api
|
|
*/
|
|
bool_t gfxSemWait(gfxSem *psem, delaytime_t ms);
|
|
|
|
/**
|
|
* @brief Signal a semaphore
|
|
* @details The semaphore counter is increased and if the result is non-positive then a waiting thread
|
|
* is queued for execution. Note that once the thread reaches "limit", further signals are
|
|
* ignored.
|
|
*
|
|
* @param[in] psem A pointer to the semaphore
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxSemSignal(gfxSem *psem);
|
|
|
|
/**
|
|
* @brief Signal a semaphore
|
|
* @details The semaphore counter is increased and if the result is non-positive then a waiting thread
|
|
* is queued for execution. Note that once the thread reaches "limit", further signals are
|
|
* ignored.
|
|
*
|
|
* @param[in] psem A pointer to the semaphore
|
|
*
|
|
* @iclass
|
|
* @api
|
|
*/
|
|
void gfxSemSignalI(gfxSem *psem);
|
|
|
|
/**
|
|
* @brief Get the current semaphore count
|
|
* @return The current semaphore count
|
|
*
|
|
* @param[in] psem A pointer to the semaphore
|
|
*
|
|
* @api
|
|
*/
|
|
semcount_t gfxSemCounter(gfxSem *pSem);
|
|
|
|
/**
|
|
* @brief Get the current semaphore count
|
|
* @return The current semaphore count
|
|
*
|
|
* @param[in] psem A pointer to the semaphore
|
|
*
|
|
* @iclass
|
|
* @api
|
|
*/
|
|
semcount_t gfxSemCounterI(gfxSem *pSem);
|
|
|
|
/**
|
|
* @brief Start a new thread.
|
|
* @return Returns a thread handle if the thread was started, NULL on an error
|
|
*
|
|
* @param[in] stackarea A pointer to the area for the new threads stack or NULL to dynamically allocate it
|
|
* @param[in] stacksz The size of the thread stack. 0 means the default operating system size although this
|
|
* is only valid when stackarea is dynamically allocated.
|
|
* @param[in] prio The priority of the new thread
|
|
* @param[in] fn The function the new thread will run
|
|
* @param[in] param A parameter to pass the thread function.
|
|
*
|
|
* @api
|
|
*/
|
|
gfxThreadHandle gfxThreadCreate(void *stackarea, size_t stacksz, threadpriority_t prio, DECLARE_THREAD_FUNCTION((*fn),p), void *param);
|
|
|
|
/**
|
|
* @brief Wait for a thread to finish.
|
|
* @return Returns the thread exit code.
|
|
*
|
|
* @param[in] thread The Thread Handle
|
|
*
|
|
* @note This will also close the thread handle as it is no longer useful
|
|
* once the thread has ended.
|
|
* @api
|
|
*/
|
|
threadreturn_t gfxThreadWait(gfxThreadHandle thread);
|
|
|
|
/**
|
|
* @brief Get the current thread handle.
|
|
* @return A thread handle
|
|
*
|
|
* @api
|
|
*/
|
|
gfxThreadHandle gfxThreadMe(void);
|
|
|
|
/**
|
|
* @brief Close the thread handle.
|
|
*
|
|
* @param[in] thread The Thread Handle
|
|
*
|
|
* @note This does not affect the thread, it just closes our handle to the thread.
|
|
*
|
|
* @api
|
|
*/
|
|
void gfxThreadClose(gfxThreadHandle thread);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* All the above was just for the doxygen documentation. All the implementation of the above
|
|
* (without any of the documentation overheads) is in the files below.
|
|
*/
|
|
#elif GFX_USE_OS_CHIBIOS
|
|
#include "gos/chibios.h"
|
|
#elif GFX_USE_OS_WIN32
|
|
#include "gos/win32.h"
|
|
#elif GFX_USE_OS_POSIX
|
|
#include "gos/posix.h"
|
|
#else
|
|
#error "Your operating system is not supported yet"
|
|
#endif
|
|
|
|
#endif /* _GOS_H */
|
|
/** @} */
|