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#ifndef MAIL_H
#define MAIL_H
#include <SDL/SDL.h>
#include <SDL/SDL_thread.h>
#include <queue>
template <typename T>
class MBox {
T val;
SDL_sem *fill, *empty;
public:
bool try_read(T &r) { // Attempt to read the mbox. Returns true if read succeeded.
if (SDL_SemTryWait(fill) == 0) {
r = val;
SDL_SemPost(empty);
return true;
} else
return false;
}
void read(T &r) {
SDL_SemWait(fill);
r = val;
SDL_SemPost(empty);
}
void write(const T &v) {
SDL_SemWait(empty);
val = v;
SDL_SemPost(fill);
}
bool try_write(const T &v) { // Returns true if the write succeeded
if (SDL_SemTryWait(empty) == 0) {
val = v;
SDL_SemPost(fill);
return true;
} else
return false;
}
MBox(T &v) {
MBox();
write(v);
}
MBox() {
fill = SDL_CreateSemaphore(0);
empty = SDL_CreateSemaphore(1);
}
~MBox() {
SDL_DestroySemaphore(fill);
SDL_DestroySemaphore(empty);
}
};
template <typename T>
class MVar {
SDL_sem *s;
public:
T val;
void lock() { SDL_SemWait(s); }
void unlock() { SDL_SemPost(s); }
MVar() { s = SDL_CreateSemaphore(1); }
~MVar() { SDL_DestroySemaphore(s); }
void write(const T &w) { lock(); val = w; unlock(); }
void read(T &r) { lock(); r = val; unlock(); }
T read() { T r; read(r); return r; }
};
template<bool start_locked = false>
class Lock {
SDL_sem *s;
public:
void lock() { SDL_SemWait(s); }
void unlock() { SDL_SemPost(s); }
Lock() { s = SDL_CreateSemaphore(start_locked ? 0 : 1); }
~Lock() { SDL_DestroySemaphore(s); }
};
template<typename T>
class Chan {
MVar<std::queue<T> > vals;
SDL_sem *fill;
public:
bool try_read(T &r) {
if (SDL_SemTryWait(fill) == 0) {
vals.lock();
r = vals.val.front();
vals.val.pop();
vals.unlock();
return true;
} else
return false;
}
void read(T &r) {
SDL_SemWait(fill);
vals.lock();
r = vals.val.front();
vals.val.pop();
vals.unlock();
}
void write(const T &w) {
vals.lock();
vals.val.push(w);
vals.unlock();
SDL_SemPost(fill);
}
Chan() {
fill = SDL_CreateSemaphore(0);
}
~Chan() {
SDL_DestroySemaphore(fill);
}
};
template<>
class Chan<void> {
SDL_sem *fill;
public:
bool try_read() {
if (SDL_SemTryWait(fill) == 0)
return true;
return false;
}
void read() {
SDL_SemWait(fill);
}
void write() {
SDL_SemPost(fill);
}
Chan() {
fill = SDL_CreateSemaphore(0);
}
~Chan() {
SDL_DestroySemaphore(fill);
}
};
template<typename L, typename R>
struct Either {
bool isL;
union {
L left;
R right;
};
Either(const L &l) {
isL = true;
left = l;
}
Either(const R &r) {
isL = false;
right = r;
}
};
#endif
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