1 #ifndef CYGONCE_KERNEL_MBOXT2_HXX
2 #define CYGONCE_KERNEL_MBOXT2_HXX
4 //==========================================================================
8 // Mboxt2 (Message Box/Mailbox) class declarations
10 //==========================================================================
11 //####ECOSGPLCOPYRIGHTBEGIN####
12 // -------------------------------------------
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41 // -------------------------------------------
42 //####ECOSGPLCOPYRIGHTEND####
43 //==========================================================================
44 //#####DESCRIPTIONBEGIN####
49 // Purpose: Define Mboxt2 class interfaces
50 // Description: The classes defined here provide the APIs for mboxt2es.
51 // Usage: #include <cyg/kernel/mboxt2.hxx>
52 // #include <cyg/kernel/mboxt2.inl>
55 //####DESCRIPTIONEND####
57 //==========================================================================
59 #include <cyg/kernel/ktypes.h>
60 #include <cyg/infra/cyg_ass.h> // assertion macros
61 #include <cyg/kernel/thread.hxx>
62 #include <cyg/kernel/thread.inl>
64 // -------------------------------------------------------------------------
65 // Message/Mail Box. This template implements a queue of T's.
66 // Implemented as a template for maximal flexibility; one would hope
67 // that only one, with T==(void *) and the same number of them,
68 // is ever used without very good reason.
70 // Cyg_Mboxt2 has a fixed size array of T's; one size fits all.
72 template <class T, cyg_count32 QUEUE_SIZE>
76 cyg_count32 base; // index of first used slot
77 cyg_count32 count; // count of used slots
78 Cyg_ThreadQueue get_threadq; // Queue of waiting threads
79 #ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
80 Cyg_ThreadQueue put_threadq; // Queue of waiting threads
83 cyg_count32 size = QUEUE_SIZE;
84 T itemqueue[ QUEUE_SIZE ];
86 // private utility functions
87 // wake up a thread from some queue
88 inline void wakeup_winner( const T &msg );
89 #ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
90 inline void wakeup_putter( void );
95 CYGDBG_DEFINE_CHECK_THIS
97 Cyg_Mboxt2(); // Constructor
98 ~Cyg_Mboxt2(); // Destructor
100 cyg_bool get( T &ritem ); // get an item; wait if none
101 #ifdef CYGFUN_KERNEL_THREADS_TIMER
102 cyg_bool get( T &ritem, cyg_tick_count abs_timeout );
104 cyg_bool tryget( T &ritem ); // just one attempt
106 cyg_bool peek_item( T &ritem ); // get next item without
109 #ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
110 cyg_bool put( const T item ); // put an item; wait if full
111 #ifdef CYGFUN_KERNEL_THREADS_TIMER
112 cyg_bool put( const T item, cyg_tick_count abs_timeout );
115 cyg_bool tryput( const T item ); // fails if Q full
118 cyg_count32 peek() // Get current count value
124 cyg_bool waiting_to_get() // Any threads waiting?
126 return ! get_threadq.empty();
130 cyg_bool waiting_to_put() // Any threads waiting?
132 #ifdef CYGMFN_KERNEL_SYNCH_MBOXT_PUT_CAN_WAIT
133 return ! put_threadq.empty();
140 // -------------------------------------------------------------------------
141 #endif // ifndef CYGONCE_KERNEL_MBOXT2_HXX