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Diffstat (limited to 'src/gos/sys_defs.h')
| -rw-r--r-- | src/gos/sys_defs.h | 445 |
1 files changed, 445 insertions, 0 deletions
diff --git a/src/gos/sys_defs.h b/src/gos/sys_defs.h new file mode 100644 index 00000000..b913fb66 --- /dev/null +++ b/src/gos/sys_defs.h @@ -0,0 +1,445 @@ +/* + * 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://ugfx.org/license.html + */ + +/** + * @file src/gos/sys_defs.h + * @brief GOS - Operating System Support header file + * + * @addtogroup GOS + * + * @brief Module to build a uniform abstraction layer between uGFX and the underlying system + * + * @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 Re-allocate memory + * @return A pointer to the new memory area or NULL if there is no more memory available + * + * @param[in] ptr The old memory area to be increased/decreased in size + * @param[in] oldsz The size in bytes of the old memory area + * @param[in] newsz The size in bytes of the new memory area + * + * @note Some operating systems don't use the oldsz parameter as they implicitly know the size of + * old memory area. The parameter must always be supplied however for API compatibility. + * @note gfxRealloc() can make the area smaller or larger but may have to return a different pointer. + * If this occurs the new area contains a copy of the data from the old area. The old memory + * pointer should not be used after this routine as the original area may have been freed. + * @note If there is insufficient memory to create the new memory region, NULL is returned and the + * old memory area is left unchanged. + * + * @api + */ + void *gfxRealloc(void *ptr, size_t oldsz, size_t newsz); + + /** + * @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 maximum 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 "src/gos/chibios.h" +#elif GFX_USE_OS_WIN32 + #include "src/gos/win32.h" +#elif GFX_USE_OS_LINUX + #include "src/gos/linux.h" +#elif GFX_USE_OS_OSX + #include "src/gos/osx.h" +#elif GFX_USE_OS_RAW32 + #include "src/gos/raw32.h" +#else + #error "Your operating system is not supported yet" +#endif + +#endif /* _GOS_H */ +/** @} */ |