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master
Marc Alexander Lehmann 10 years ago
parent 733969f153
commit dd48a90e38
2 changed files with 210 additions and 8 deletions
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      Changes
  2. 217
      ev.c

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@ -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

217
ev.c
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@ -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 */

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