janwas
c65d966112
lib: speed up round_up by requiring alignment to be a power of 2 This was SVN commit r2221.
43 lines
1.0 KiB
C
Executable File
43 lines
1.0 KiB
C
Executable File
#ifdef __cplusplus
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extern "C" {
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#endif
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const size_t CPU_TYPE_LEN = 49; // processor brand string is <= 48 chars
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extern char cpu_type[CPU_TYPE_LEN];
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extern double cpu_freq;
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// -1 if detect not yet called, or cannot be determined
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extern int cpus;
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extern int cpu_speedstep;
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extern int cpu_smp;
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// are there actually multiple physical processors,
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// not only logical hyperthreaded CPUs? relevant for wtime.
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// not possible with POSIX calls.
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// called from ia32.cpp check_smp
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extern int on_each_cpu(void(*cb)());
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extern void get_cpu_info(void);
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// atomic "compare and swap". compare the machine word at <location> against
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// <expected>; if not equal, return false; otherwise, overwrite it with
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// <new_value> and return true.
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extern bool CAS_(uintptr_t* location, uintptr_t expected, uintptr_t new_value);
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#define CAS(l,o,n) CAS_((uintptr_t*)l, (uintptr_t)o, (uintptr_t)n)
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extern void atomic_add(intptr_t* location, intptr_t increment);
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// enforce strong memory ordering.
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extern void mfence();
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extern void serialize();
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#ifdef __cplusplus
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}
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#endif
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