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--- src/lib/libast/features/mmap.orig 2016-02-28 17:09:23 UTC
+++ src/lib/libast/features/mmap
@@ -16,14 +16,7 @@ tst lib_mmap note{ standard mmap interfa
#define Failed(file) (remove(file),1)
- int
- #if _STD_
- main(int argc, char** argv)
- #else
- main(argc,argv)
- int argc;
- char** argv;
- #endif
+ int main(int argc, char** argv)
{
caddr_t mm;
char *file;
@@ -165,169 +158,18 @@ tst lib_mmap64 -D_LARGEFILE64_SOURCE not
}
}end
-tst mmap_anon note{ use mmap MAP_ANON to get raw memory }end execute{
- #if !_lib_mmap
- (
- #endif
- #include <unistd.h>
- #include <fcntl.h>
- #include <sys/types.h>
- #include <sys/mman.h>
- #if defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
- #define MAP_ANON MAP_ANONYMOUS
- #endif
- int
- main()
- { void *addr;
- addr = mmap(0,1024*1024,PROT_READ|PROT_WRITE,MAP_ANON|MAP_PRIVATE,-1,0);
- return (addr && addr != (void*)(-1)) ? 0 : 1;
- }
-}end
-
-tst mmap_devzero note{ use mmap on /dev/zero to get raw memory }end execute{
- #if !_lib_mmap
- (
- #endif
- #include <unistd.h>
- #include <fcntl.h>
- #include <sys/types.h>
- #include <sys/mman.h>
- int
- main()
- { int fd;
- void *addr;
- if((fd = open("/dev/zero", O_RDWR)) < 0)
- return 1;
- addr = mmap(0,1024*1024,PROT_READ|PROT_WRITE,MAP_PRIVATE,fd,0);
- return (addr && addr != (void*)(-1)) ? 0 : 1;
- }
-}end
-
-tst -D_LARGEFILE64_SOURCE note{ mmap is worth using }end output{
- #if !_lib_mmap
- (
- #endif
- #include <unistd.h>
- #include <fcntl.h>
- #include <string.h>
- #include <sys/types.h>
- #include <sys/mman.h>
- #include <sys/stat.h>
- #include <sys/times.h>
-
- #if _lib_mmap64
- #undef mmap
- #define mmap mmap64
- #endif
-
- #if _lib_munmap64
- #undef munmap
- #define munmap munmap64
- #endif
-
- #define MAPSIZE (64*1024)
- #define BUFSIZE (MAPSIZE/8)
- #define WRITE (64)
- #define RUN (64)
-
- #define Failed(file) (remove(file),1)
-
- int
- #if _STD_
- main(int argc, char** argv)
- #else
- main(argc,argv)
- int argc;
- char** argv;
- #endif
- {
- caddr_t mm;
- char *file, *t;
- int i, fd, k, run;
- char buf[MAPSIZE];
- struct tms stm, etm;
- clock_t rdtm, mmtm;
-
- file = argv[1];
- if ((fd = open(file, O_CREAT|O_TRUNC|O_WRONLY, 0666)) < 0)
- return 1;
-
- for (i = 0; i < sizeof(buf); ++i)
- buf[i] = '0' + (i%10);
- for (i = 0; i < WRITE; ++i)
- if (write(fd,buf,sizeof(buf)) != sizeof(buf))
- return Failed(file);
- close(fd);
-
- /* read time */
- times(&stm);
- for(run = 0; run < RUN; ++run)
- { if((fd = open(file, O_RDWR)) < 0)
- return Failed(file);
- for (i = 0; i < WRITE; ++i)
- { for(k = 0; k < MAPSIZE; k += BUFSIZE)
- if (read(fd,buf,BUFSIZE) != BUFSIZE)
- return Failed(file);
- }
- close(fd);
- }
- times(&etm);
- rdtm = (etm.tms_utime-stm.tms_utime) + (etm.tms_stime-stm.tms_stime);
-
- /* mmap time */
- times(&stm);
- for(run = 0; run < RUN; ++run)
- { if ((fd = open(file, O_RDWR)) < 0)
- return Failed(file);
- for(i = 0, mm = (caddr_t)0; i < WRITE; ++i)
- { if(mm)
- munmap(mm, MAPSIZE);
- mm = (caddr_t)mmap((caddr_t)0, MAPSIZE,
- (PROT_READ|PROT_WRITE),
- MAP_PRIVATE, fd, i*MAPSIZE );
- if(mm == (caddr_t)(-1) || mm == (caddr_t)0)
- return Failed(file);
-
- /* the memcpy is < BUFSIZE to simulate the
- fact that functions like sfreserve/sfgetr do
- not do buffer copying.
- */
- t = (char*)mm;
- for(k = 0; k < MAPSIZE; k += BUFSIZE, t += BUFSIZE)
- memcpy(buf,t,(3*BUFSIZE)/4);
- }
- close(fd);
- }
- times(&etm);
- mmtm = (etm.tms_utime-stm.tms_utime) + (etm.tms_stime-stm.tms_stime);
-
- remove(file);
-
- if(4*mmtm <= 3*rdtm)
- printf("#define _mmap_worthy 2 /* mmap outperforms read on 64Ki buffers -- use it */\n");
- else if(4*mmtm <= 5*rdtm)
- printf("#define _mmap_worthy 2 /* mmap is slightly better than read on 64Ki buffers -- use it */\n");
- else
- printf("#define _mmap_worthy 2 /* mmap worse than read on 64Ki buffers -- use it anyway */\n");
-
- return 0;
- }
-}end
-
cat{
+ /* assume MAP_ANON works */
+ #define _mmap_anon 1
/* some systems get it wrong but escape concise detection */
- #ifndef _NO_MMAP
#if __CYGWIN__
#define _NO_MMAP 1
#endif
- #endif
#if _NO_MMAP
#undef _lib_mmap
#undef _lib_mmap64
- #undef _mmap_anon
- #undef _mmap_devzero
- #undef _mmap_worthy
+ #undef _mmap_anon
#endif
}end
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