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