[fusl] clang-format fusl

fusl/src/thread/synccall.c

 #include "pthread_impl.h"
 #include <semaphore.h>
 #include <unistd.h>
 #include <dirent.h>
 #include <string.h>
 #include <ctype.h>
 #include "futex.h"
 #include "atomic.h"
 #include "../dirent/__dirent.h"
 
 static struct chain {
-        struct chain *next;
-        int tid;
-        sem_t target_sem, caller_sem;
-} *volatile head;
+  struct chain* next;
+  int tid;
+  sem_t target_sem, caller_sem;
+} * volatile head;
 
 static volatile int synccall_lock[2];
 static volatile int target_tid;
-static void (*callback)(void *), *context;
+static void (*callback)(void*), *context;
 static volatile int dummy = 0;
 weak_alias(dummy, __block_new_threads);
 
-static void handler(int sig)
-{
-        struct chain ch;
-        int old_errno = errno;
+static void handler(int sig) {
+  struct chain ch;
+  int old_errno = errno;
 
-        sem_init(&ch.target_sem, 0, 0);
-        sem_init(&ch.caller_sem, 0, 0);
+  sem_init(&ch.target_sem, 0, 0);
+  sem_init(&ch.caller_sem, 0, 0);
 
-        ch.tid = __syscall(SYS_gettid);
+  ch.tid = __syscall(SYS_gettid);
 
-        do ch.next = head;
-        while (a_cas_p(&head, ch.next, &ch) != ch.next);
+  do
+    ch.next = head;
+  while (a_cas_p(&head, ch.next, &ch) != ch.next);
 
-        if (a_cas(&target_tid, ch.tid, 0) == (ch.tid | 0x80000000))
-                __syscall(SYS_futex, &target_tid, FUTEX_UNLOCK_PI|FUTEX_PRIVATE);
+  if (a_cas(&target_tid, ch.tid, 0) == (ch.tid | 0x80000000))
+    __syscall(SYS_futex, &target_tid, FUTEX_UNLOCK_PI | FUTEX_PRIVATE);
 
-        sem_wait(&ch.target_sem);
-        callback(context);
-        sem_post(&ch.caller_sem);
-        sem_wait(&ch.target_sem);
+  sem_wait(&ch.target_sem);
+  callback(context);
+  sem_post(&ch.caller_sem);
+  sem_wait(&ch.target_sem);
 
-        errno = old_errno;
+  errno = old_errno;
 }
 
-void __synccall(void (*func)(void *), void *ctx)
-{
-        sigset_t oldmask;
-        int cs, i, r, pid, self;;
-        DIR dir = {0};
-        struct dirent *de;
-        struct sigaction sa = { .sa_flags = 0, .sa_handler = handler };
-        struct chain *cp, *next;
-        struct timespec ts;
+void __synccall(void (*func)(void*), void* ctx) {
+  sigset_t oldmask;
+  int cs, i, r, pid, self;
+  ;
+  DIR dir = {0};
+  struct dirent* de;
+  struct sigaction sa = {.sa_flags = 0, .sa_handler = handler};
+  struct chain *cp, *next;
+  struct timespec ts;
 
-        /* Blocking signals in two steps, first only app-level signals
-         * before taking the lock, then all signals after taking the lock,
-         * is necessary to achieve AS-safety. Blocking them all first would
-         * deadlock if multiple threads called __synccall. Waiting to block
-         * any until after the lock would allow re-entry in the same thread
-         * with the lock already held. */
-        __block_app_sigs(&oldmask);
-        LOCK(synccall_lock);
-        __block_all_sigs(0);
-        pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
+  /* Blocking signals in two steps, first only app-level signals
+   * before taking the lock, then all signals after taking the lock,
+   * is necessary to achieve AS-safety. Blocking them all first would
+   * deadlock if multiple threads called __synccall. Waiting to block
+   * any until after the lock would allow re-entry in the same thread
+   * with the lock already held. */
+  __block_app_sigs(&oldmask);
+  LOCK(synccall_lock);
+  __block_all_sigs(0);
+  pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
 
-        head = 0;
+  head = 0;
 
-        if (!libc.threaded) goto single_threaded;
+  if (!libc.threaded)
+    goto single_threaded;
 
-        callback = func;
-        context = ctx;
+  callback = func;
+  context = ctx;
 
-        /* This atomic store ensures that any signaled threads will see the
-         * above stores, and prevents more than a bounded number of threads,
-         * those already in pthread_create, from creating new threads until
-         * the value is cleared to zero again. */
-        a_store(&__block_new_threads, 1);
+  /* This atomic store ensures that any signaled threads will see the
+   * above stores, and prevents more than a bounded number of threads,
+   * those already in pthread_create, from creating new threads until
+   * the value is cleared to zero again. */
+  a_store(&__block_new_threads, 1);
 
-        /* Block even implementation-internal signals, so that nothing
-         * interrupts the SIGSYNCCALL handlers. The main possible source
-         * of trouble is asynchronous cancellation. */
-        memset(&sa.sa_mask, -1, sizeof sa.sa_mask);
-        __libc_sigaction(SIGSYNCCALL, &sa, 0);
+  /* Block even implementation-internal signals, so that nothing
+   * interrupts the SIGSYNCCALL handlers. The main possible source
+   * of trouble is asynchronous cancellation. */
+  memset(&sa.sa_mask, -1, sizeof sa.sa_mask);
+  __libc_sigaction(SIGSYNCCALL, &sa, 0);
 
-        pid = __syscall(SYS_getpid);
-        self = __syscall(SYS_gettid);
+  pid = __syscall(SYS_getpid);
+  self = __syscall(SYS_gettid);
 
-        /* Since opendir is not AS-safe, the DIR needs to be setup manually
-         * in automatic storage. Thankfully this is easy. */
-        dir.fd = open("/proc/self/task", O_RDONLY|O_DIRECTORY|O_CLOEXEC);
-        if (dir.fd < 0) goto out;
+  /* Since opendir is not AS-safe, the DIR needs to be setup manually
+   * in automatic storage. Thankfully this is easy. */
+  dir.fd = open("/proc/self/task", O_RDONLY | O_DIRECTORY | O_CLOEXEC);
+  if (dir.fd < 0)
+    goto out;
 
-        /* Initially send one signal per counted thread. But since we can't
-         * synchronize with thread creation/exit here, there could be too
-         * few signals. This initial signaling is just an optimization, not
-         * part of the logic. */
-        for (i=libc.threads_minus_1; i; i--)
-                __syscall(SYS_kill, pid, SIGSYNCCALL);
+  /* Initially send one signal per counted thread. But since we can't
+   * synchronize with thread creation/exit here, there could be too
+   * few signals. This initial signaling is just an optimization, not
+   * part of the logic. */
+  for (i = libc.threads_minus_1; i; i--)
+    __syscall(SYS_kill, pid, SIGSYNCCALL);
 
-        /* Loop scanning the kernel-provided thread list until it shows no
-         * threads that have not already replied to the signal. */
-        for (;;) {
-                int miss_cnt = 0;
-                while ((de = readdir(&dir))) {
-                        if (!isdigit(de->d_name[0])) continue;
-                        int tid = atoi(de->d_name);
-                        if (tid == self || !tid) continue;
+  /* Loop scanning the kernel-provided thread list until it shows no
+   * threads that have not already replied to the signal. */
+  for (;;) {
+    int miss_cnt = 0;
+    while ((de = readdir(&dir))) {
+      if (!isdigit(de->d_name[0]))
+        continue;
+      int tid = atoi(de->d_name);
+      if (tid == self || !tid)
+        continue;
 
-                        /* Set the target thread as the PI futex owner before
-                         * checking if it's in the list of caught threads. If it
-                         * adds itself to the list after we check for it, then
-                         * it will see its own tid in the PI futex and perform
-                         * the unlock operation. */
-                        a_store(&target_tid, tid);
+      /* Set the target thread as the PI futex owner before
+       * checking if it's in the list of caught threads. If it
+       * adds itself to the list after we check for it, then
+       * it will see its own tid in the PI futex and perform
+       * the unlock operation. */
+      a_store(&target_tid, tid);
 
-                        /* Thread-already-caught is a success condition. */
-                        for (cp = head; cp && cp->tid != tid; cp=cp->next);
-                        if (cp) continue;
+      /* Thread-already-caught is a success condition. */
+      for (cp = head; cp && cp->tid != tid; cp = cp->next)
+        ;
+      if (cp)
+        continue;
 
-                        r = -__syscall(SYS_tgkill, pid, tid, SIGSYNCCALL);
+      r = -__syscall(SYS_tgkill, pid, tid, SIGSYNCCALL);
 
-                        /* Target thread exit is a success condition. */
-                        if (r == ESRCH) continue;
+      /* Target thread exit is a success condition. */
+      if (r == ESRCH)
+        continue;
 
-                        /* The FUTEX_LOCK_PI operation is used to loan priority
-                         * to the target thread, which otherwise may be unable
-                         * to run. Timeout is necessary because there is a race
-                         * condition where the tid may be reused by a different
-                         * process. */
-                        clock_gettime(CLOCK_REALTIME, &ts);
-                        ts.tv_nsec += 10000000;
-                        if (ts.tv_nsec >= 1000000000) {
-                                ts.tv_sec++;
-                                ts.tv_nsec -= 1000000000;
-                        }
-                        r = -__syscall(SYS_futex, &target_tid,
-                                FUTEX_LOCK_PI|FUTEX_PRIVATE, 0, &ts);
+      /* The FUTEX_LOCK_PI operation is used to loan priority
+       * to the target thread, which otherwise may be unable
+       * to run. Timeout is necessary because there is a race
+       * condition where the tid may be reused by a different
+       * process. */
+      clock_gettime(CLOCK_REALTIME, &ts);
+      ts.tv_nsec += 10000000;
+      if (ts.tv_nsec >= 1000000000) {
+        ts.tv_sec++;
+        ts.tv_nsec -= 1000000000;
+      }
+      r = -__syscall(SYS_futex, &target_tid, FUTEX_LOCK_PI | FUTEX_PRIVATE, 0,
+                     &ts);
 
-                        /* Obtaining the lock means the thread responded. ESRCH
-                         * means the target thread exited, which is okay too. */
-                        if (!r || r == ESRCH) continue;
+      /* Obtaining the lock means the thread responded. ESRCH
+       * means the target thread exited, which is okay too. */
+      if (!r || r == ESRCH)
+        continue;
 
-                        miss_cnt++;
-                }
-                if (!miss_cnt) break;
-                rewinddir(&dir);
-        }
-        close(dir.fd);
+      miss_cnt++;
+    }
+    if (!miss_cnt)
+      break;
+    rewinddir(&dir);
+  }
+  close(dir.fd);
 
-        /* Serialize execution of callback in caught threads. */
-        for (cp=head; cp; cp=cp->next) {
-                sem_post(&cp->target_sem);
-                sem_wait(&cp->caller_sem);
-        }
+  /* Serialize execution of callback in caught threads. */
+  for (cp = head; cp; cp = cp->next) {
+    sem_post(&cp->target_sem);
+    sem_wait(&cp->caller_sem);
+  }
 
-        sa.sa_handler = SIG_IGN;
-        __libc_sigaction(SIGSYNCCALL, &sa, 0);
+  sa.sa_handler = SIG_IGN;
+  __libc_sigaction(SIGSYNCCALL, &sa, 0);
 
 single_threaded:
-        func(ctx);
+  func(ctx);
 
-        /* Only release the caught threads once all threads, including the
-         * caller, have returned from the callback function. */
-        for (cp=head; cp; cp=next) {
-                next = cp->next;
-                sem_post(&cp->target_sem);
-        }
+  /* Only release the caught threads once all threads, including the
+   * caller, have returned from the callback function. */
+  for (cp = head; cp; cp = next) {
+    next = cp->next;
+    sem_post(&cp->target_sem);
+  }
 
 out:
-        a_store(&__block_new_threads, 0);
-        __wake(&__block_new_threads, -1, 1);
+  a_store(&__block_new_threads, 0);
+  __wake(&__block_new_threads, -1, 1);
 
-        pthread_setcancelstate(cs, 0);
-        UNLOCK(synccall_lock);
-        __restore_sigs(&oldmask);
+  pthread_setcancelstate(cs, 0);
+  UNLOCK(synccall_lock);
+  __restore_sigs(&oldmask);
 }