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f7780de24b
Cosmopolitan now supports mremap(), which is only supported on Linux and NetBSD. First, it allows memory mappings to be relocated without copying them; this can dramatically speed up data structures like std::vector if the array size grows larger than 256kb. The mremap() system call is also 10x faster than munmap() when shrinking large memory mappings. There's now two functions, getpagesize() and getgransize() which help to write portable code that uses mmap(MAP_FIXED). Alternative sysconf() may be called with our new _SC_GRANSIZE. The madvise() system call now has a better wrapper with improved documentation.
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
#ifndef COSMOPOLITAN_LIBC_SYSV_CONSTS_MAP_H_
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#define COSMOPOLITAN_LIBC_SYSV_CONSTS_MAP_H_
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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extern const int MAP_32BIT;
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extern const int MAP_ANON;
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extern const int MAP_ANONYMOUS;
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extern const int MAP_CONCEAL;
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extern const int MAP_DENYWRITE;
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extern const int MAP_EXECUTABLE;
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extern const int MAP_FILE;
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extern const int MAP_FIXED;
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extern const int MAP_FIXED_NOREPLACE;
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extern const int MAP_HASSEMAPHORE;
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extern const int MAP_HUGETLB;
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extern const int MAP_INHERIT;
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extern const int MAP_JIT;
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extern const int MAP_LOCKED;
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extern const int MAP_NOCACHE;
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extern const int MAP_NOEXTEND;
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extern const int MAP_NOFORK;
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extern const int MAP_NONBLOCK;
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extern const int MAP_NORESERVE;
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extern const int MAP_NOSYNC;
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extern const int MAP_POPULATE;
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extern const int MAP_PRIVATE;
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extern const int MAP_SHARED;
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extern const int MAP_SHARED_VALIDATE;
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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#define MAP_FILE 0
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#define MAP_SHARED 1
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#define MAP_PRIVATE 2
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#define MAP_TYPE 15
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#define MAP_FIXED 16
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#define MAP_ANONYMOUS MAP_ANONYMOUS
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#define MAP_CONCEAL MAP_CONCEAL
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#define MAP_EXECUTABLE MAP_EXECUTABLE
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#define MAP_FIXED_NOREPLACE MAP_FIXED_NOREPLACE
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#define MAP_HASSEMAPHORE MAP_HASSEMAPHORE
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#define MAP_POPULATE MAP_POPULATE
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#define MAP_NORESERVE MAP_NORESERVE
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#define MAP_ANON MAP_ANONYMOUS
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#define MAP_NOCORE MAP_CONCEAL
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#endif /* COSMOPOLITAN_LIBC_SYSV_CONSTS_MAP_H_ */
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