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cosmopolitan/libc/runtime/runtime.h
Justine Tunney ec480f5aa0
Make improvements 
- Every unit test now passes on Apple Silicon. The final piece of this
  puzzle was porting our POSIX threads cancelation support, since that
  works differently on ARM64 XNU vs. AMD64. Our semaphore support on
  Apple Silicon is also superior now compared to AMD64, thanks to the
  grand central dispatch library which lets *NSYNC locks go faster.

- The Cosmopolitan runtime is now more stable, particularly on Windows.
  To do this, thread local storage is mandatory at all runtime levels,
  and the innermost packages of the C library is no longer being built
  using ASAN. TLS is being bootstrapped with a 128-byte TIB during the
  process startup phase, and then later on the runtime re-allocates it
  either statically or dynamically to support code using _Thread_local.
  fork() and execve() now do a better job cooperating with threads. We
  can now check how much stack memory is left in the process or thread
  when functions like kprintf() / execve() etc. call alloca(), so that
  ENOMEM can be raised, reduce a buffer size, or just print a warning.

- POSIX signal emulation is now implemented the same way kernels do it
  with pthread_kill() and raise(). Any thread can interrupt any other
  thread, regardless of what it's doing. If it's blocked on read/write
  then the killer thread will cancel its i/o operation so that EINTR can
  be returned in the mark thread immediately. If it's doing a tight CPU
  bound operation, then that's also interrupted by the signal delivery.
  Signal delivery works now by suspending a thread and pushing context
  data structures onto its stack, and redirecting its execution to a
  trampoline function, which calls SetThreadContext(GetCurrentThread())
  when it's done.

- We're now doing a better job managing locks and handles. On NetBSD we
  now close semaphore file descriptors in forked children. Semaphores on
  Windows can now be canceled immediately, which means mutexes/condition
  variables will now go faster. Apple Silicon semaphores can be canceled
  too. We're now using Apple's pthread_yield() funciton. Apple _nocancel
  syscalls are now used on XNU when appropriate to ensure pthread_cancel
  requests aren't lost. The MbedTLS library has been updated to support
  POSIX thread cancelations. See tool/build/runitd.c for an example of
  how it can be used for production multi-threaded tls servers. Handles
  on Windows now leak less often across processes. All i/o operations on
  Windows are now overlapped, which means file pointers can no longer be
  inherited across dup() and fork() for the time being.

- We now spawn a thread on Windows to deliver SIGCHLD and wakeup wait4()
  which means, for example, that posix_spawn() now goes 3x faster. POSIX
  spawn is also now more correct. Like Musl, it's now able to report the
  failure code of execve() via a pipe although our approach favors using
  shared memory to do that on systems that have a true vfork() function.

- We now spawn a thread to deliver SIGALRM to threads when setitimer()
  is used. This enables the most precise wakeups the OS makes possible.

- The Cosmopolitan runtime now uses less memory. On NetBSD for example,
  it turned out the kernel would actually commit the PT_GNU_STACK size
  which caused RSS to be 6mb for every process. Now it's down to ~4kb.
  On Apple Silicon, we reduce the mandatory upstream thread size to the
  smallest possible size to reduce the memory overhead of Cosmo threads.
  The examples directory has a program called greenbean which can spawn
  a web server on Linux with 10,000 worker threads and have the memory
  usage of the process be ~77mb. The 1024 byte overhead of POSIX-style
  thread-local storage is now optional; it won't be allocated until the
  pthread_setspecific/getspecific functions are called. On Windows, the
  threads that get spawned which are internal to the libc implementation
  use reserve rather than commit memory, which shaves a few hundred kb.

- sigaltstack() is now supported on Windows, however it's currently not
  able to be used to handle stack overflows, since crash signals are
  still generated by WIN32. However the crash handler will still switch
  to the alt stack, which is helpful in environments with tiny threads.

- Test binaries are now smaller. Many of the mandatory dependencies of
  the test runner have been removed. This ensures many programs can do a
  better job only linking the the thing they're testing. This caused the
  test binaries for LIBC_FMT for example, to decrease from 200kb to 50kb

- long double is no longer used in the implementation details of libc,
  except in the APIs that define it. The old code that used long double
  for time (instead of struct timespec) has now been thoroughly removed.

- ShowCrashReports() is now much tinier in MODE=tiny. Instead of doing
  backtraces itself, it'll just print a command you can run on the shell
  using our new `cosmoaddr2line` program to view the backtrace.

- Crash report signal handling now works in a much better way. Instead
  of terminating the process, it now relies on SA_RESETHAND so that the
  default SIG_IGN behavior can terminate the process if necessary.

- Our pledge() functionality has now been fully ported to AARCH64 Linux.
2023-09-18 21:04:47 -07:00

148 lines
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C
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#ifndef COSMOPOLITAN_LIBC_RUNTIME_RUNTIME_H_
#define COSMOPOLITAN_LIBC_RUNTIME_RUNTIME_H_
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
/*───────────────────────────────────────────────────────────────────────────│─╗
│ cosmopolitan § runtime ─╬─│┼
╚────────────────────────────────────────────────────────────────────────────│*/
#ifdef __x86_64__
typedef long jmp_buf[8];
#elif defined(__aarch64__)
typedef long jmp_buf[22];
#elif defined(__powerpc64__)
typedef unsigned __int128 jmp_buf[32];
#elif defined(__s390x__)
typedef unsigned long jmp_buf[18];
#elif defined(__riscv)
typedef unsigned long jmp_buf[26];
#endif
typedef long sigjmp_buf[12];
void mcount(void);
int daemon(int, int);
unsigned long getauxval(unsigned long);
int setjmp(jmp_buf)
libcesque returnstwice paramsnonnull();
void longjmp(jmp_buf, int) libcesque wontreturn paramsnonnull();
int _setjmp(jmp_buf)
libcesque returnstwice paramsnonnull();
int sigsetjmp(sigjmp_buf, int) libcesque returnstwice paramsnonnull();
void siglongjmp(sigjmp_buf, int) libcesque wontreturn paramsnonnull();
void _longjmp(jmp_buf, int) libcesque wontreturn paramsnonnull();
void exit(int) wontreturn;
void _exit(int) libcesque wontreturn;
void _Exit(int) libcesque wontreturn;
void quick_exit(int) wontreturn;
void abort(void) wontreturn;
int __cxa_atexit(void *, void *, void *) paramsnonnull((1)) libcesque;
int atexit(void (*)(void)) paramsnonnull() libcesque;
char *getenv(const char *) paramsnonnull() __wur nosideeffect libcesque;
int putenv(char *);
int setenv(const char *, const char *, int);
int unsetenv(const char *);
int clearenv(void);
void fpreset(void);
void *mmap(void *, uint64_t, int32_t, int32_t, int32_t, int64_t);
int munmap(void *, uint64_t);
int mprotect(void *, uint64_t, int);
int msync(void *, size_t, int);
int mlock(const void *, size_t);
int munlock(const void *, size_t);
long gethostid(void);
int sethostid(long);
char *getlogin(void);
int getlogin_r(char *, size_t);
int login_tty(int);
int getpagesize(void);
int syncfs(int);
int vhangup(void);
int getdtablesize(void);
int sethostname(const char *, size_t);
int acct(const char *);
#if defined(_GNU_SOURCE) || defined(_COSMO_SOURCE)
extern char **environ;
char *secure_getenv(const char *) paramsnonnull() __wur nosideeffect libcesque;
#endif
#ifdef _COSMO_SOURCE
extern int __argc;
extern char **__argv;
extern char **__envp;
extern unsigned long *__auxv;
extern bool __interruptible;
extern intptr_t __oldstack;
extern uint64_t __nosync;
extern int __strace;
extern int __ftrace;
extern uint64_t __syscount;
extern uint64_t kStartTsc;
extern const char kNtSystemDirectory[];
extern const char kNtWindowsDirectory[];
extern size_t __virtualmax;
extern size_t __stackmax;
extern bool __isworker;
/* utilities */
void _intsort(int *, size_t);
void _longsort(long *, size_t);
/* diagnostics */
void ShowCrashReports(void);
void __printargs(const char *);
int ftrace_install(void);
int ftrace_enabled(int);
int strace_enabled(int);
void _bt(const char *, ...);
void __print_maps(void);
long _GetMaxFd(void);
/* builtin shell language */
int _cocmd(int, char **, char **);
/* executable program */
char *GetProgramExecutableName(void);
char *GetInterpreterExecutableName(char *, size_t);
int __open_executable(void);
/* execution control */
int verynice(void);
axdx_t setlongerjmp(jmp_buf)
libcesque returnstwice paramsnonnull();
void longerjmp(jmp_buf, intptr_t) libcesque wontreturn paramsnonnull();
void __warn_if_powersave(void);
void _Exit1(int) libcesque wontreturn;
void __paginate(int, const char *);
/* memory management */
void _weakfree(void *);
void *_mapanon(size_t) attributeallocsize((1)) mallocesque;
void *_mapshared(size_t) attributeallocsize((1)) mallocesque;
void CheckForMemoryLeaks(void);
void CheckForFileLeaks(void);
void __enable_threads(void);
void __oom_hook(size_t);
bool _isheap(void *);
/* code morphing */
void __morph_begin(void);
void __morph_end(void);
/* portability */
int NtGetVersion(void) pureconst;
bool IsGenuineBlink(void);
bool IsCygwin(void);
const char *GetCpuidOs(void);
const char *GetCpuidEmulator(void);
void GetCpuidBrand(char[13], uint32_t);
long __get_rlimit(int);
int __set_rlimit(int, int64_t);
const char *__describe_os(void);
long __get_sysctl(int, int);
int __get_arg_max(void) pureconst;
int __get_cpu_count(void) pureconst;
long __get_avphys_pages(void) pureconst;
long __get_phys_pages(void) pureconst;
long __get_minsigstksz(void) pureconst;
void __get_main_stack(void **, size_t *, int *);
long __get_safe_size(long, long);
char *__get_tmpdir(void);
#endif /* _COSMO_SOURCE */
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_RUNTIME_RUNTIME_H_ */
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