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#ifndef _HTIF_CONTEXT_H
#define _HTIF_CONTEXT_H
// A replacement for ucontext.h, which is sadly deprecated.
#include <pthread.h>
#if defined(__GLIBC__)
# undef USE_UCONTEXT
# define USE_UCONTEXT
# include <ucontext.h>
# include <memory>
#include <limits.h>
#if (ULONG_MAX > UINT_MAX) // 64-bit systems only
#if (100*GLIB_MAJOR_VERSION+GLIB_MINOR_VERSION < 208)
#define GLIBC_64BIT_PTR_BUG
static_assert (sizeof(unsigned int) == 4, "uint size doesn't match expected 32bit");
static_assert (sizeof(unsigned long) == 8, "ulong size doesn't match expected 64bit");
static_assert (sizeof(void*) == 8, "ptr size doesn't match expected 64bit");
#endif
#endif /* ULONG_MAX > UINT_MAX */
#endif
class context_t
{
public:
context_t();
~context_t();
void init(void (*func)(void*), void* arg);
void switch_to();
static context_t* current();
private:
context_t* creator;
void (*func)(void*);
void* arg;
#ifdef USE_UCONTEXT
std::unique_ptr<ucontext_t> context;
#ifndef GLIBC_64BIT_PTR_BUG
static void wrapper(context_t*);
#else
static void wrapper(unsigned int, unsigned int);
#endif
#else
pthread_t thread;
pthread_mutex_t mutex;
pthread_cond_t cond;
volatile int flag;
static void* wrapper(void*);
#endif
};
#endif
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