Squashed commit of the following:

commit b35cea7 Author: Mike Miller <[email protected]> Date: Fri Nov 11 07:08:07 2022 -0800 hostname now settable by root, uptime reports the time when the app was started rather than iDevice time, stuff in /proc gets app boot time for ctime and mtime and current time for atime. Minor code cleanup commit 5f0b712 Author: Mike Miller <[email protected]> Date: Mon Nov 7 08:55:25 2022 -0800 Fix some of my stupid, remove last of the old extra locking stuff, make lint happier, check for pending signals before doing some things commit 6cdefc1 Author: Mike Miller <[email protected]> Date: Wed Nov 2 15:27:58 2022 -0700 Added Jason Conway's Re Ordering patch (upstream PR ish-app#1944. Fixed a bunch of compiler complaints about uncast variables, removed "easter egg" for now. commit 02b6bd0 Merge: 50eaba1 e73525e Author: Mike Miller <[email protected]> Date: Sun Oct 30 10:08:56 2022 -0700 Merge branch 'ish-app-master' into dev Upstream merge commit e73525e Merge: 50eaba1 0c0fa0f Author: Mike Miller <[email protected]> Date: Sun Oct 30 10:08:32 2022 -0700 Merge branch 'master' of https://github.com/ish-app/ish into ish-app-master Merging upstream commit 50eaba1 Author: Mike Miller <[email protected]> Date: Sun Oct 30 10:04:24 2022 -0700 Fixed elock so that it doesn't crash the app when toggled commit e98aefd Author: Mike Miller <[email protected]> Date: Sat Oct 29 19:24:27 2022 -0700 Repurpose the enable_extralocking stuff to enable or disable additional thread coherency code, disable app_nap, preliminary checks to try to figure out if a non musl/Alpine release is running. commit 0c0fa0f Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Fri Oct 28 06:09:13 2022 +0000 Bump version to 429 commit 10533be Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Fri Oct 28 00:36:07 2022 +0000 Update Alpine repositories commit d79dbcf Author: Mike Miller <[email protected]> Date: Thu Oct 27 16:58:46 2022 -0700 Remove what little extra locking stuff remained. It still appears in /proc/ish for backwards compatibility, but does nothing. commit f578a0a Author: Mike Miller <[email protected]> Date: Thu Oct 27 15:49:34 2022 -0700 Some cleanup/fixing in regards to lock->comm, plus cleanup and bug fixing of a bogus unlock of &pid_lock that I introduced in August. commit 5ac825c Author: Mike Miller <[email protected]> Date: Wed Oct 26 19:36:09 2022 -0700 More tweaks to reduce the odds of processes hanging. Also disabled sse, as it was causing issues with ssl on Alpine. commit e718794 Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Wed Oct 26 06:09:24 2022 +0000 Bump version to 428 commit 11e8c7f Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Wed Oct 26 00:35:53 2022 +0000 Update Alpine repositories commit 2b31cc6 Author: Theodore Dubois <[email protected]> Date: Tue Oct 25 09:13:09 2022 -0700 Update linux commit 062067f Author: Mike Miller <[email protected]> Date: Tue Oct 25 11:26:35 2022 -0700 Checkpoint, much improved stability due to checking task->pending and not killing stuff when it is set. commit 568eee3 Merge: 410615e 4daeff3 Author: Mike Miller <[email protected]> Date: Mon Oct 24 17:45:31 2022 -0700 Merge branch 'ish-app-master' into dev Merged upstream commit 4daeff3 Merge: 410615e 074ddee Author: Mike Miller <[email protected]> Date: Mon Oct 24 17:45:04 2022 -0700 Merge branch 'master' of https://github.com/ish-app/ish into ish-app-master Merged upstream changes commit 074ddee Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Mon Oct 24 06:38:30 2022 +0000 Bump version to 427 commit 3aacc18 Author: Theodore Dubois <[email protected]> Date: Sun Oct 23 22:11:08 2022 -0700 Port emulator poke to arm commit 0511e42 Merge: b24478a 7be7e0d Author: tbodt <[email protected]> Date: Sun Oct 23 19:30:27 2022 -0700 Merge pull request ish-app#1933 from saagarjha/master commit 7be7e0d Author: Saagar Jha <[email protected]> Date: Sun Oct 23 18:18:57 2022 -0700 Replace chatty syscall stubs with silent variant These syscalls have fallbacks in musl which we do implement but they are only invoked after they return ENOSYS, which fills dmesg with lots of spam. commit b24478a Author: Theodore Dubois <[email protected]> Date: Sun Oct 23 17:20:55 2022 -0700 Allow specifying kconfig for xcode commit 4d722ed Merge: 903919e f76e46a Author: tbodt <[email protected]> Date: Sun Oct 23 14:28:02 2022 -0700 Merge pull request ish-app#1926 from jason-conway/i-make-money-movs commit 903919e Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Sat Oct 22 06:14:01 2022 +0000 Bump version to 426 commit 611044e Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Sat Oct 22 00:39:53 2022 +0000 Update Alpine repositories commit c07a1b5 Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Fri Oct 21 06:20:33 2022 +0000 Bump version to 425 commit 19cc084 Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Fri Oct 21 00:36:22 2022 +0000 Update Alpine repositories commit defd059 Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Thu Oct 20 06:14:37 2022 +0000 Bump version to 424 commit f18a2b0 Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Thu Oct 20 00:38:06 2022 +0000 Update Alpine repositories commit 5b2fbc8 Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Wed Oct 19 06:36:10 2022 +0000 Bump version to 423 commit 4906b64 Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Wed Oct 19 00:40:18 2022 +0000 Update Alpine repositories commit 3b82191 Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Sun Oct 16 06:14:06 2022 +0000 Bump version to 422 commit f76e46a Author: Jason Conway <[email protected]> Date: Sat Oct 15 20:35:03 2022 -0500 Update golden file commit 8146bf6 Author: Jason Conway <[email protected]> Date: Sat Oct 15 20:33:25 2022 -0500 Expand qemu-test and add tests for new instructions commit 5bd020b Author: Jason Conway <[email protected]> Date: Sat Oct 15 20:26:38 2022 -0500 legalize instructions Add mov instructions for packed floating-point values; single-precision min, max, and sqrt; movntq and movntdq commit 5e5263b Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Sun Oct 16 00:41:43 2022 +0000 Update Alpine repositories commit 410615e Author: Mike Miller <[email protected]> Date: Sat Oct 15 14:54:36 2022 -0700 Checkpoint, build 321 I think commit 36e181d Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Tue Oct 11 06:25:17 2022 +0000 Bump version to 421 commit f365fa8 Author: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com> Date: Tue Oct 11 00:36:35 2022 +0000 Update Alpine repositories
emkey1 · Nov 15, 2022 · 26dd852 · 26dd852
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Showing 22 changed files with 230 additions and 212 deletions.
diff --git a/app/AppDelegate.m b/app/AppDelegate.m
@@ -53,8 +53,8 @@ static void ios_handle_exit(struct task *task, int code) {
         return;
     // pid should be saved now since task would be freed
     pid_t pid = task->pid;
-    if(pids_lock.pid == pid)
-        unlock(&pids_lock);
+ //   if(pids_lock.pid == pid)
+  //      unlock(&pids_lock);
 //    while((critical_region_count(task)) || (locks_held_count(task))) { // Wait for now, task is in one or more critical sections, and/or has locks
 //        nanosleep(&lock_pause, NULL);
 //    }

diff --git a/app/UserPreferences.m b/app/UserPreferences.m
@@ -448,7 +448,7 @@ - (BOOL)validateShouldEnableExtraLocking:(id *)value error:(NSError **)error {
     // Should set task->critical_region.count to 0 for all active processes when this is set to false.  Otherwise stuff blows up.  -mke
     if(doEnableExtraLocking == true) {  // This needs to be the opposite of what you would expect because of reasons.  -mke
         complex_lockt(&pids_lock, 0, __FILE__, __LINE__);
-        dword_t res = zero_critical_regions_count();
+        zero_critical_regions_count();
         unlock(&pids_lock);
     }
     return [*value isKindOfClass:NSNumber.class];

diff --git a/emu/memory.c b/emu/memory.c
@@ -358,8 +358,6 @@ void *mem_ptr(struct mem *mem, addr_t addr, int type) {
 #endif
 
         // if page is cow, ~~milk~~ copy it
-        if(doEnableExtraLocking)
-           extra_lockf(0, __FILE__, __LINE__);
 
         if (entry->flags & P_COW) {
             lock(&current->general_lock, 0);  // prevent elf_exec from doing mm_release while we are in flight?  -mke
@@ -380,9 +378,6 @@ void *mem_ptr(struct mem *mem, addr_t addr, int type) {
 
         }
 
-        if(doEnableExtraLocking)
-           extra_unlockf(0, __FILE__, __LINE__);
-
     }
 
     void *ptr = mem_ptr_nofault(mem, addr, type);

diff --git a/fs/dir.c b/fs/dir.c
@@ -15,6 +15,7 @@ static unsigned long fd_telldir(struct fd *fd) {
 
 static void fd_seekdir(struct fd *fd, unsigned long off) {
     fd->offset = off;
+
     if (fd->ops->seekdir)
         fd->ops->seekdir(fd, off);
 }
@@ -72,6 +73,8 @@ int_t sys_getdents_common(fd_t f, addr_t dirents, dword_t count,
     int printed = 0;
     while (true) {
         ptr = fd_telldir(fd);
+        extern time_t boot_time;
+        fd->stat.atime = (dword_t)boot_time;
         struct dir_entry entry;
         err = fd->ops->readdir(fd, &entry);
         if (err < 0)
@@ -81,6 +84,7 @@ int_t sys_getdents_common(fd_t f, addr_t dirents, dword_t count,
 
         size_t max_reclen = sizeof(struct linux_dirent64_) + strlen(entry.name) + 4;
         char dirent_data[max_reclen];
+        dirent_data[0] = 0;
         ino_t inode = entry.inode;
         off_t_ offset = fd_telldir(fd);
         const char *name = entry.name;

diff --git a/fs/fd.c b/fs/fd.c
@@ -18,6 +18,7 @@ struct fd *fd_create(const struct fd_ops *ops) {
     fd->flags = 0;
     fd->mount = NULL;
     fd->offset = 0;
+    fd->stat.ctime = (dword_t)time(NULL);
     list_init(&fd->poll_fds);
     lock_init(&fd->poll_lock);
     lock_init(&fd->lock);
@@ -49,6 +50,8 @@ int fd_close(struct fd *fd) {
             mount_release(fd->mount);
         free(fd);
     }
+    if(fd->inode != NULL)
+        fd->stat.atime = (dword_t)time(NULL);
     return err;
 }
 

diff --git a/fs/pipe.c b/fs/pipe.c
@@ -13,6 +13,7 @@ static fd_t pipe_f_create(int pipe_fd, int flags) {
     fd->stat.mode = S_IFIFO | 0660;
     fd->stat.uid = current->uid;
     fd->stat.gid = current->gid;
+    fd->stat.ctime = (dword_t)time(NULL);
     return f_install(fd, flags);
 }
 

diff --git a/fs/proc.c b/fs/proc.c
@@ -78,10 +78,14 @@ static int proc_getpath(struct fd *fd, char *buf) {
 
 static int proc_stat(struct mount *UNUSED(mount), const char *path, struct statbuf *stat) {
     struct proc_entry entry = {0};
+    extern time_t boot_time;
     int err = proc_lookup(path, &entry);
     if (err < 0)
         return err;
     int ret = proc_entry_stat(&entry, stat);
+    stat->atime = (dword_t)time(NULL);
+    stat->mtime = (dword_t)boot_time;
+    stat->ctime = (dword_t)boot_time;
     proc_entry_cleanup(&entry);
     return ret;
 }

diff --git a/jit/gadgets-aarch64/gadgets.h b/jit/gadgets-aarch64/gadgets.h
@@ -31,6 +31,7 @@ _xaddr .req x3
 .endm
 .macro gret pop=0
     ldr x8, [_ip, \pop*8]!
+    dmb ishld /* Jason Conway's Re Ordering patch (upstream PR #1944 */
     add _ip, _ip, 8 /* TODO get rid of this */
     br x8
 .endm

diff --git a/kernel/calls.c b/kernel/calls.c
@@ -11,7 +11,6 @@ extern bool isGlibC;
 
 dword_t syscall_stub(void) {
     STRACE("syscall_stub()");
-    //STRACE("syscall_stub()");
     return _ENOSYS;
 }
 dword_t syscall_stub_silent(void) {
@@ -271,7 +270,9 @@ syscall_t syscall_table[] = {
     [383] = (syscall_t) syscall_stub_silent, // statx
     [384] = (syscall_t) sys_arch_prctl,
     [403] = (syscall_t) syscall_stub, // clock_gettime64
+    [406] = (syscall_t) syscall_stub, // clock_getres_time64
     [407] = (syscall_t) syscall_stub, // clock_nanosleep_time64
+    [412] = (syscall_t) syscall_stub, // utimensat_time64
     [436] = (syscall_t) syscall_stub,
     [439] = (syscall_t) sys_faccessat, // faccessat2
 };

diff --git a/kernel/exit.c b/kernel/exit.c
@@ -62,7 +62,11 @@ noreturn void do_exit(int status) {
 
     bool signal_pending = !!(current->pending & ~current->blocked);
     // has to happen before mm_release
-    while((critical_region_count(current) > 1) || (locks_held_count(current)) || (current->process_info_being_read) || (signal_pending)) { // Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
+
+    while((critical_region_count(current) > 1) ||
+          (locks_held_count(current)) ||
+          (current->process_info_being_read) ||
+          (signal_pending)) { // Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
         nanosleep(&lock_pause, NULL);
         signal_pending = !!(current->pending & ~current->blocked);
     }
@@ -77,17 +81,28 @@ noreturn void do_exit(int status) {
     do {
         nanosleep(&lock_pause, NULL);
         signal_pending = !!(current->pending & ~current->blocked);
-    } while((critical_region_count(current) > 1) || (locks_held_count(current)) || (current->process_info_being_read) || (signal_pending)); // Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
+    } while((critical_region_count(current) > 1) ||
+            (locks_held_count(current)) ||
+            (current->process_info_being_read) ||
+            (signal_pending)); // Wait for now, task is in one or more critical
     mm_release(current->mm);
     current->mm = NULL;
+
     signal_pending = !!(current->pending & ~current->blocked);
-    while((critical_region_count(current) > 1) || (locks_held_count(current)) || (current->process_info_being_read) || (signal_pending)) { // Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
+    while((critical_region_count(current) > 1) ||
+          (locks_held_count(current)) ||
+          (current->process_info_being_read) ||
+          (signal_pending)) { // Wait for now, task is in one or more critical // Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
         nanosleep(&lock_pause, NULL);
         signal_pending = !!(current->pending & ~current->blocked);
     }
     fdtable_release(current->files);
     current->files = NULL;
-    while((critical_region_count(current) > 1) || (locks_held_count(current)) || (current->process_info_being_read) || (signal_pending)) { // Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
+
+    while((critical_region_count(current) > 1) ||
+          (locks_held_count(current)) ||
+          (current->process_info_being_read) ||
+          (signal_pending)) { // Wait for now, task is in one or more critical // Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
         nanosleep(&lock_pause, NULL);
         signal_pending = !!(current->pending & ~current->blocked);
     }
@@ -97,8 +112,10 @@ noreturn void do_exit(int status) {
     // sighand must be released below so it can be protected by pids_lock
     // since it can be accessed by other threads
 
-    //while(critical_region_count(current)) {
-    while((critical_region_count(current) > 1) || (locks_held_count(current)) || (current->process_info_being_read) || (signal_pending)) { // Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
+    while((critical_region_count(current) > 1) ||
+          (locks_held_count(current)) ||
+          (current->process_info_being_read) ||
+          (signal_pending)) { // Wait for now, task is in one or more critical// Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
         nanosleep(&lock_pause, NULL);
         signal_pending = !!(current->pending & ~current->blocked);
     }
@@ -115,7 +132,10 @@ noreturn void do_exit(int status) {
     complex_lockt(&pids_lock, 0, __FILE__, __LINE__);
     // release the sighand
     signal_pending = !!(current->pending & ~current->blocked);
-    while((critical_region_count(current) > 2) || (locks_held_count(current)) || (current->process_info_being_read) || (signal_pending)) { // Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
+    while((critical_region_count(current) > 2) ||
+          (locks_held_count(current)) ||
+          (current->process_info_being_read) ||
+          (signal_pending)) { // Wait for now, task is in one or more critical // Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
         nanosleep(&lock_pause, NULL);
         signal_pending = !!(current->pending & ~current->blocked);
     }
@@ -139,7 +159,10 @@ noreturn void do_exit(int status) {
 
     signal_pending = !!(current->pending & ~current->blocked);
 
-    while((critical_region_count(current) > 2) || (locks_held_count(current)) || (current->process_info_being_read) || (signal_pending)) { // Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
+    while((critical_region_count(current) > 2) ||
+          (locks_held_count(current)) ||
+          (current->process_info_being_read) ||
+          (signal_pending)) { // Wait for now, task is in one or more critical // Wait for now, task is in one or more critical sections, and/or has locks, or signals in flight
         nanosleep(&lock_pause, NULL);
         signal_pending = !!(current->pending & ~current->blocked);
     }
@@ -263,8 +286,13 @@ dword_t sys_exit_group(dword_t status) {
 static bool reap_if_zombie(struct task *task, struct siginfo_ *info_out, struct rusage_ *rusage_out, int options) {
     if (!task->zombie)
         return false;
-    while((critical_region_count(task) > 1) || (locks_held_count(task))) { // Wait for now, task is in one or more critical sections, and/or has locks
+    bool signal_pending = !!(task->pending & ~task->blocked);
+    while(((signal_pending) ||
+           (critical_region_count(task) > 1) ||
+           (locks_held_count(task))) &&
+           (task->pid > 10)) {
         nanosleep(&lock_pause, NULL);
+        signal_pending = !!(task->pending & ~task->blocked);
     }
     complex_lockt(&task->group->lock, 0, __FILE__, __LINE__);
 
@@ -292,26 +320,58 @@ static bool reap_if_zombie(struct task *task, struct siginfo_ *info_out, struct
    // lock(&pids_lock); //mkemkemke  Doesn't work
     //if(doEnableExtraLocking) //mke Doesn't work
      //   extra_lockf(task->pid);
-    while((critical_region_count(task) > 1) || (locks_held_count(task))) { // Wait for now, task is in one or more critical sections, and/or has locks
+
+    signal_pending = !!(task->pending & ~task->blocked);
+    while(((signal_pending) ||
+           (critical_region_count(task) > 1) ||
+           (locks_held_count(task))) &&
+           (task->pid > 10)) {
         nanosleep(&lock_pause, NULL);
+        signal_pending = !!(task->pending & ~task->blocked);
     }
     cond_destroy(&task->group->child_exit);
-    while((critical_region_count(task) > 1) || (locks_held_count(task))) { // Wait for now, task is in one or more critical sections, and/or has locks
+
+    signal_pending = !!(task->pending & ~task->blocked);
+    while(((signal_pending) ||
+           (critical_region_count(task) > 1) ||
+           (locks_held_count(task))) &&
+           (task->pid > 10)) {
         nanosleep(&lock_pause, NULL);
+        signal_pending = !!(task->pending & ~task->blocked);
     }
     task_leave_session(task);
-    while((critical_region_count(task) > 1) || (locks_held_count(task))) { // Wait for now, task is in one or more critical sections, and/or has locks
+
+    signal_pending = !!(task->pending & ~task->blocked);
+    while(((signal_pending) ||
+           (critical_region_count(task) > 1) ||
+           (locks_held_count(task))) &&
+           (task->pid > 10)) {
         nanosleep(&lock_pause, NULL);
+        signal_pending = !!(task->pending & ~task->blocked);
     }
     list_remove(&task->group->pgroup);
-    while((critical_region_count(task) > 1) || (locks_held_count(task))) { // Wait for now, task is in one or more critical sections, and/or has locks
+
+    signal_pending = !!(task->pending & ~task->blocked);
+    while(((signal_pending) ||
+           (critical_region_count(task) > 1) ||
+           (locks_held_count(task))) &&
+           (task->pid > 10)) {
         nanosleep(&lock_pause, NULL);
+        signal_pending = !!(task->pending & ~task->blocked);
     }
     free(task->group);
-    while((critical_region_count(task) > 1) || (locks_held_count(task))) { // Wait for now, task is in one or more critical sections, and/or has locks
+
+    signal_pending = !!(task->pending & ~task->blocked);
+    while(((signal_pending) ||
+           (critical_region_count(task) > 1) ||
+           (locks_held_count(task))) &&
+           (task->pid > 10)) {
         nanosleep(&lock_pause, NULL);
+        signal_pending = !!(task->pending & ~task->blocked);
     }
+    //complex_lockt(&pids_lock, 0, __FILE__, __LINE__);
     task_destroy(task);
+    //unlock(&pids_lock);
 
     return true;
 }

diff --git a/kernel/fs.c b/kernel/fs.c
@@ -120,7 +120,7 @@ dword_t sys_readlinkat(fd_t at_f, addr_t path_addr, addr_t buf_addr, dword_t buf
         if (user_write(buf_addr, buf, size))
             return _EFAULT;
     }
-    return size;
+    return (dword_t)size;
 }
 
 dword_t sys_readlink(addr_t path_addr, addr_t buf_addr, dword_t bufsize) {

diff --git a/kernel/mmap.c b/kernel/mmap.c
@@ -49,23 +49,19 @@ void mm_release(struct mm *mm) {
             nanosleep(&lock_pause, NULL);
         }
 
-        if(doEnableExtraLocking)
-            extra_lockf(0, __FILE__, __LINE__);
         mem_destroy(&mm->mem);
         while((critical_region_count(current) > 1) || (current->process_info_being_read)) { // Wait for now, task is in one or more critical sections
             nanosleep(&lock_pause, NULL);
         }
         free(mm);
-        if(doEnableExtraLocking)
-           extra_unlockf(0, __FILE__, __LINE__);
     }
 }
 
 static addr_t do_mmap(addr_t addr, dword_t len, dword_t prot, dword_t flags, fd_t fd_no, dword_t offset) {
     int err;
     pages_t pages = PAGE_ROUND_UP(len);
     if (!pages) return _EINVAL;
-    page_t page;
+    page_t page = 0;
     if (addr != 0) {
         if (PGOFFSET(addr) != 0)
             return _EINVAL;

diff --git a/kernel/resource_locking.h b/kernel/resource_locking.h
@@ -6,4 +6,5 @@ extern unsigned critical_region_count(struct task*);
 extern void modify_critical_region_counter(struct task*, int, char*, int);
 extern unsigned locks_held_count(struct task*);
 extern void modify_locks_held_count(struct task*, int);
+extern bool current_is_valid(void);