diff options
| -rw-r--r-- | Changes | 1 | ||||
| -rw-r--r-- | ev.c | 217 |
2 files changed, 210 insertions, 8 deletions
@@ -12,6 +12,7 @@ TODO: store pid for each signal TODO: document file descriptor usage per loop TODO: store loop pid_t and compare isndie signal handler,store 1 for same, 2 for differign pid, clean up in loop_fork TODO: embed watchers need updating when fd changes +TODO: document portbaility requirements for atomic pointer access - destroying a non-default loop would stop the global waitpid watcher (Denis Bilenko). - queueing pending watchers of higher priority from a watcher now invokes @@ -507,7 +507,7 @@ struct signalfd_siginfo #define ECB_H /* 16 bits major, 16 bits minor */ -#define ECB_VERSION 0x00010001 +#define ECB_VERSION 0x00010002 #ifdef _WIN32 typedef signed char int8_t; @@ -532,7 +532,6 @@ struct signalfd_siginfo typedef uint32_t uintptr_t; typedef int32_t intptr_t; #endif - typedef intptr_t ptrdiff_t; #else #include <inttypes.h> #if UINTMAX_MAX > 0xffffffffU @@ -563,6 +562,16 @@ struct signalfd_siginfo #define ECB_CPP (__cplusplus+0) #define ECB_CPP11 (__cplusplus >= 201103L) +#if ECB_CPP + #define ECB_EXTERN_C extern "C" + #define ECB_EXTERN_C_BEG ECB_EXTERN_C { + #define ECB_EXTERN_C_END } +#else + #define ECB_EXTERN_C extern + #define ECB_EXTERN_C_BEG + #define ECB_EXTERN_C_END +#endif + /*****************************************************************************/ /* ECB_NO_THREADS - ecb is not used by multiple threads, ever */ @@ -617,9 +626,16 @@ struct signalfd_siginfo #if ECB_GCC_VERSION(4,7) /* see comment below (stdatomic.h) about the C11 memory model. */ #define ECB_MEMORY_FENCE __atomic_thread_fence (__ATOMIC_SEQ_CST) - #elif defined __clang && __has_feature (cxx_atomic) - /* see comment below (stdatomic.h) about the C11 memory model. */ - #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) + + /* The __has_feature syntax from clang is so misdesigned that we cannot use it + * without risking compile time errors with other compilers. We *could* + * define our own ecb_clang_has_feature, but I just can't be bothered to work + * around this shit time and again. + * #elif defined __clang && __has_feature (cxx_atomic) + * // see comment below (stdatomic.h) about the C11 memory model. + * #define ECB_MEMORY_FENCE __c11_atomic_thread_fence (__ATOMIC_SEQ_CST) + */ + #elif ECB_GCC_VERSION(4,4) || defined __INTEL_COMPILER || defined __clang__ #define ECB_MEMORY_FENCE __sync_synchronize () #elif _MSC_VER >= 1400 /* VC++ 2005 */ @@ -937,14 +953,32 @@ ecb_inline uint64_t ecb_rotr64 (uint64_t x, unsigned int count) { return (x << ( #endif /* try to tell the compiler that some condition is definitely true */ -#define ecb_assume(cond) do { if (!(cond)) ecb_unreachable (); } while (0) +#define ecb_assume(cond) if (!(cond)) ecb_unreachable (); else 0 ecb_inline unsigned char ecb_byteorder_helper (void) ecb_const; ecb_inline unsigned char ecb_byteorder_helper (void) { - const uint32_t u = 0x11223344; - return *(unsigned char *)&u; + /* the union code still generates code under pressure in gcc, */ + /* but less than using pointers, and always seems to */ + /* successfully return a constant. */ + /* the reason why we have this horrible preprocessor mess */ + /* is to avoid it in all cases, at least on common architectures */ + /* or when using a recent enough gcc version (>= 4.6) */ +#if __i386 || __i386__ || _M_X86 || __amd64 || __amd64__ || _M_X64 + return 0x44; +#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ + return 0x44; +#elif __BYTE_ORDER__ && __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ + return 0x11; +#else + union + { + uint32_t i; + uint8_t c; + } u = { 0x11223344 }; + return u.c; +#endif } ecb_inline ecb_bool ecb_big_endian (void) ecb_const; @@ -985,6 +1019,173 @@ ecb_inline ecb_bool ecb_little_endian (void) { return ecb_byteorder_helper () == #define ecb_array_length(name) (sizeof (name) / sizeof (name [0])) #endif +/*******************************************************************************/ +/* floating point stuff, can be disabled by defining ECB_NO_LIBM */ + +/* basically, everything uses "ieee pure-endian" floating point numbers */ +/* the only noteworthy exception is ancient armle, which uses order 43218765 */ +#if 0 \ + || __i386 || __i386__ \ + || __amd64 || __amd64__ || __x86_64 || __x86_64__ \ + || __powerpc__ || __ppc__ || __powerpc64__ || __ppc64__ \ + || defined __arm__ && defined __ARM_EABI__ \ + || defined __s390__ || defined __s390x__ \ + || defined __mips__ \ + || defined __alpha__ \ + || defined __hppa__ \ + || defined __ia64__ \ + || defined _M_IX86 || defined _M_AMD64 || defined _M_IA64 + #define ECB_STDFP 1 + #include <string.h> /* for memcpy */ +#else + #define ECB_STDFP 0 + #include <math.h> /* for frexp*, ldexp* */ +#endif + +#ifndef ECB_NO_LIBM + + /* convert a float to ieee single/binary32 */ + ecb_function_ uint32_t ecb_float_to_binary32 (float x) ecb_const; + ecb_function_ uint32_t + ecb_float_to_binary32 (float x) + { + uint32_t r; + + #if ECB_STDFP + memcpy (&r, &x, 4); + #else + /* slow emulation, works for anything but -0 */ + uint32_t m; + int e; + + if (x == 0e0f ) return 0x00000000U; + if (x > +3.40282346638528860e+38f) return 0x7f800000U; + if (x < -3.40282346638528860e+38f) return 0xff800000U; + if (x != x ) return 0x7fbfffffU; + + m = frexpf (x, &e) * 0x1000000U; + + r = m & 0x80000000U; + + if (r) + m = -m; + + if (e <= -126) + { + m &= 0xffffffU; + m >>= (-125 - e); + e = -126; + } + + r |= (e + 126) << 23; + r |= m & 0x7fffffU; + #endif + + return r; + } + + /* converts an ieee single/binary32 to a float */ + ecb_function_ float ecb_binary32_to_float (uint32_t x) ecb_const; + ecb_function_ float + ecb_binary32_to_float (uint32_t x) + { + float r; + + #if ECB_STDFP + memcpy (&r, &x, 4); + #else + /* emulation, only works for normals and subnormals and +0 */ + int neg = x >> 31; + int e = (x >> 23) & 0xffU; + + x &= 0x7fffffU; + + if (e) + x |= 0x800000U; + else + e = 1; + + /* we distrust ldexpf a bit and do the 2**-24 scaling by an extra multiply */ + r = ldexpf (x * (0.5f / 0x800000U), e - 126); + + r = neg ? -r : r; + #endif + + return r; + } + + /* convert a double to ieee double/binary64 */ + ecb_function_ uint64_t ecb_double_to_binary64 (double x) ecb_const; + ecb_function_ uint64_t + ecb_double_to_binary64 (double x) + { + uint64_t r; + + #if ECB_STDFP + memcpy (&r, &x, 8); + #else + /* slow emulation, works for anything but -0 */ + uint64_t m; + int e; + + if (x == 0e0 ) return 0x0000000000000000U; + if (x > +1.79769313486231470e+308) return 0x7ff0000000000000U; + if (x < -1.79769313486231470e+308) return 0xfff0000000000000U; + if (x != x ) return 0X7ff7ffffffffffffU; + + m = frexp (x, &e) * 0x20000000000000U; + + r = m & 0x8000000000000000;; + + if (r) + m = -m; + + if (e <= -1022) + { + m &= 0x1fffffffffffffU; + m >>= (-1021 - e); + e = -1022; + } + + r |= ((uint64_t)(e + 1022)) << 52; + r |= m & 0xfffffffffffffU; + #endif + + return r; + } + + /* converts an ieee double/binary64 to a double */ + ecb_function_ double ecb_binary64_to_double (uint64_t x) ecb_const; + ecb_function_ double + ecb_binary64_to_double (uint64_t x) + { + double r; + + #if ECB_STDFP + memcpy (&r, &x, 8); + #else + /* emulation, only works for normals and subnormals and +0 */ + int neg = x >> 63; + int e = (x >> 52) & 0x7ffU; + + x &= 0xfffffffffffffU; + + if (e) + x |= 0x10000000000000U; + else + e = 1; + + /* we distrust ldexp a bit and do the 2**-53 scaling by an extra multiply */ + r = ldexp (x * (0.5 / 0x10000000000000U), e - 1022); + + r = neg ? -r : r; + #endif + + return r; + } + +#endif + #endif /* ECB.H END */ |