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#ifndef __SITECING_SCOREBOARD_H
#define __SITECING_SCOREBOARD_H
#include <sys/types.h>
/**
* @file
* @brief the scoreboard manager.
*/
/**
* @def MAX_SITECING_SCOREBOARD_SLOTS
* The maximum number of slots scoreboard can hold.
*/
#define MAX_SITECING_SCOREBOARD_SLOTS 512
namespace sitecing {
/**
* The scoreboard slot.
*/
struct scoreboard_slot {
/**
* The state enumeration.
*/
enum _state {
/**
* The slot is free.
*/
state_free = 0,
/**
* The slot is allocated.
*/
state_allocated,
/**
* The process is idle.
*/
state_idle,
/**
* The process is accepting connection.
*/
state_accept,
/**
* The process is processing request.
*/
state_processing
} state;
pid_t pid;
};
/**
* The scoreboard manager.
*/
class scoreboard {
/**
* shared memory id.
*/
int shmid;
public:
/**
* Pointer to the scoreboard slots.
*/
scoreboard_slot *slots;
scoreboard();
~scoreboard();
/**
* Allocate a scoreboard slot.
* @return the slot number.
*/
int allocate_slot();
/**
* Free the slot allocated.
* @param slot the slot number.
*/
void free_slot(int slot);
/**
* Get the pointer to the slot.
* @param slot the slot number.
* @return the pointer.
*/
scoreboard_slot *get_slot(int slot);
/**
* Find the slot corresponding to the process ID.
* @param pid the process id.
* @return the slot number.
*/
int get_slot_by_pid(pid_t pid);
/**
* Count the slots in the particular state.
* @param state the state.
* @return the number of slots found.
*/
int count_slots(enum scoreboard_slot::_state state=scoreboard_slot::state_free);
};
}
#endif /* __SITECING_SCOREBOARD_H */
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