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Add raw memory visualization tool to redbean

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This change introduces a `-W /dev/pts/1` flag to redbean. What it does
is use the mincore() system call to create a dual-screen terminal
display that lets you troubleshoot the virtual address space. This is
useful since page faults are an important thing to consider when using a
forking web server. Now we have a colorful visualization of which pages
are going to fault and which ones are resident in memory.

The memory monitor, if enabled, spawns as a thread that just outputs
ANSI codes to the second terminal in a loop. In order to make this
happen using the new clone() polyfill, stdio is now thread safe.

This change also introduces some new demo pages to redbean. It also
polishes the demos we already have, to look a bit nicer and more
presentable for the upcoming release, with better explanations too.
This commit is contained in:
Justine Tunney 2022-05-14 04:33:58 -07:00
parent 578cb21591
commit 80b211e314
106 changed files with 1483 additions and 592 deletions
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46
libc/stdio/stdio.h
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@ -24,7 +24,8 @@ typedef struct FILE {
uint32_t size; /* 0x20 */
uint32_t nofree; /* 0x24 */
int pid; /* 0x28 */
char *getln;
char lock; /* 0x2c */
char *getln; /* 0x30 */
} FILE;
extern FILE *stdin;
@ -135,11 +136,48 @@ int fwide(FILE *, int);
#define vfscanf(F, FMT, VA) (vfscanf)(F, SFLINK(FMT), VA)
#endif
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#define stdin SYMBOLIC(stdin)
#define stdout SYMBOLIC(stdout)
#define stderr SYMBOLIC(stderr)
/*───────────────────────────────────────────────────────────────────────────│─╗
│ cosmopolitan § standard i/o » without mutexes ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
void flockfile(FILE *);
void funlockfile(FILE *);
int ftrylockfile(FILE *);
int getc_unlocked(FILE *) paramsnonnull();
int getchar_unlocked(void);
int putc_unlocked(int, FILE *) paramsnonnull();
int putchar_unlocked(int);
void clearerr_unlocked(FILE *);
int feof_unlocked(FILE *);
int ferror_unlocked(FILE *);
int fileno_unlocked(FILE *);
int fflush_unlocked(FILE *);
int fgetc_unlocked(FILE *);
int fputc_unlocked(int, FILE *);
size_t fread_unlocked(void *, size_t, size_t, FILE *);
size_t fwrite_unlocked(const void *, size_t, size_t, FILE *);
char *fgets_unlocked(char *, int, FILE *);
int fputs_unlocked(const char *, FILE *);
wint_t getwc_unlocked(FILE *);
wint_t getwchar_unlocked(void);
wint_t fgetwc_unlocked(FILE *);
wint_t fputwc_unlocked(wchar_t, FILE *);
wint_t putwc_unlocked(wchar_t, FILE *);
wint_t putwchar_unlocked(wchar_t);
wchar_t *fgetws_unlocked(wchar_t *, int, FILE *);
int fputws_unlocked(const wchar_t *, FILE *);
wint_t ungetwc_unlocked(wint_t, FILE *) paramsnonnull();
int ungetc_unlocked(int, FILE *) paramsnonnull();
#define getc_unlocked(f) fgetc_unlocked(f)
#define getwc_unlocked(f) fgetwc_unlocked(f)
#define putc_unlocked(c, f) fputc_unlocked(c, f)
#define putwc_unlocked(c, f) fputwc_unlocked(c, f)
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_STDIO_STDIO_H_ */