diff --git a/include/log/log.h b/include/log/log.h
index e0dc3a3..1cdf7bc 100644
--- a/include/log/log.h
+++ b/include/log/log.h
@@ -616,12 +616,7 @@
  * Use the per-tag properties "log.tag.<tagname>" to generate a runtime
  * result of non-zero to expose a log.
  */
-/* default prio ANDROID_LOG_VERBOSE to ANDROID_LOG_FATAL if no property */
-#define ANDROID_LOGGABLE_FLAG_DEFAULT_MASK      0x000F
-/* Save 2 syscalls if caller guarantees to never call within signal handler */
-#define ANDROID_LOGGABLE_FLAG_NOT_WITHIN_SIGNAL 0x8000
-
-int __android_log_is_loggable(int prio, const char *tag, int flag);
+int __android_log_is_loggable(int prio, const char *tag, int def);
 
 int __android_log_error_write(int tag, const char *subTag, int32_t uid, const char *data,
                               uint32_t dataLen);
diff --git a/liblog/fake_log_device.c b/liblog/fake_log_device.c
index fcdb6c9..8a8ece2 100644
--- a/liblog/fake_log_device.c
+++ b/liblog/fake_log_device.c
@@ -24,7 +24,6 @@
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <signal.h>
 #include <stdlib.h>
 #include <string.h>
 
@@ -98,33 +97,18 @@
  */
 static pthread_mutex_t fakeLogDeviceLock = PTHREAD_MUTEX_INITIALIZER;
 
-static void lock(sigset_t *sigflags)
+static void lock()
 {
-    /*
-     * If we trigger a signal handler in the middle of locked activity and the
-     * signal handler logs a message, we could get into a deadlock state.
-     */
-    sigset_t all;
-
-    sigfillset(&all);
-    pthread_sigmask(SIG_BLOCK, &all, sigflags);
     pthread_mutex_lock(&fakeLogDeviceLock);
 }
 
-static void unlock(sigset_t *sigflags)
+static void unlock()
 {
     pthread_mutex_unlock(&fakeLogDeviceLock);
-    pthread_sigmask(SIG_UNBLOCK, sigflags, NULL);
 }
-
-#define DECLARE_SIGSET(name) sigset_t name
-
 #else   // !defined(_WIN32)
-
-#define lock(sigflags) ((void)0)
-#define unlock(sigflags) ((void)0)
-#define DECLARE_SIGSET(name)
-
+#define lock() ((void)0)
+#define unlock() ((void)0)
 #endif  // !defined(_WIN32)
 
 
@@ -170,9 +154,8 @@
 static void deleteFakeFd(int fd)
 {
     LogState *ls;
-    DECLARE_SIGSET(sigflags);
 
-    lock(&sigflags);
+    lock();
 
     ls = fdToLogState(fd);
     if (ls != NULL) {
@@ -181,7 +164,7 @@
         free(ls);
     }
 
-    unlock(&sigflags);
+    unlock();
 }
 
 /*
@@ -565,13 +548,12 @@
 static ssize_t logWritev(int fd, const struct iovec* vector, int count)
 {
     LogState* state;
-    DECLARE_SIGSET(sigflags);
 
     /* Make sure that no-one frees the LogState while we're using it.
      * Also guarantees that only one thread is in showLog() at a given
      * time (if it matters).
      */
-    lock(&sigflags);
+    lock();
 
     state = fdToLogState(fd);
     if (state == NULL) {
@@ -616,10 +598,10 @@
     }
 
 bail:
-    unlock(&sigflags);
+    unlock();
     return vector[0].iov_len + vector[1].iov_len + vector[2].iov_len;
 error:
-    unlock(&sigflags);
+    unlock();
     return -1;
 }
 
@@ -639,9 +621,8 @@
 {
     LogState *logState;
     int fd = -1;
-    DECLARE_SIGSET(sigflags);
 
-    lock(&sigflags);
+    lock();
 
     logState = createLogState();
     if (logState != NULL) {
@@ -651,7 +632,7 @@
         errno = ENFILE;
     }
 
-    unlock(&sigflags);
+    unlock();
 
     return fd;
 }
diff --git a/liblog/log_is_loggable.c b/liblog/log_is_loggable.c
index 9d043ff..814d96d 100644
--- a/liblog/log_is_loggable.c
+++ b/liblog/log_is_loggable.c
@@ -16,39 +16,12 @@
 
 #include <ctype.h>
 #include <pthread.h>
-#include <signal.h>
 #include <stdlib.h>
 #include <string.h>
 #define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
 #include <sys/_system_properties.h>
 
 #include <android/log.h>
-#include <log/log.h>
-
-static pthread_mutex_t lock_loggable = PTHREAD_MUTEX_INITIALIZER;
-
-static void lock(sigset_t *sigflags)
-{
-    /*
-     * If we trigger a signal handler in the middle of locked activity and the
-     * signal handler logs a message, we could get into a deadlock state.
-     */
-    if (sigflags) {
-        sigset_t all;
-
-        sigfillset(&all);
-        pthread_sigmask(SIG_BLOCK, &all, sigflags);
-    }
-    pthread_mutex_lock(&lock_loggable);
-}
-
-static void unlock(sigset_t *sigflags)
-{
-    pthread_mutex_unlock(&lock_loggable);
-    if (sigflags) {
-        pthread_sigmask(SIG_UNBLOCK, sigflags, NULL);
-    }
-}
 
 struct cache {
     const prop_info *pinfo;
@@ -76,7 +49,9 @@
     cache->c = buf[0];
 }
 
-static int __android_log_level(const char *tag, int flag)
+static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+
+static int __android_log_level(const char *tag, int def)
 {
     /* sizeof() is used on this array below */
     static const char log_namespace[] = "persist.log.tag.";
@@ -108,11 +83,10 @@
         { NULL, -1, 0 },
         { NULL, -1, 0 }
     };
-    sigset_t sigflags;
 
     strcpy(key, log_namespace);
 
-    lock((flag & ANDROID_LOGGABLE_FLAG_NOT_WITHIN_SIGNAL) ? NULL : &sigflags);
+    pthread_mutex_lock(&lock);
 
     current_global_serial = __system_property_area_serial();
 
@@ -182,7 +156,7 @@
 
     global_serial = current_global_serial;
 
-    unlock((flag & ANDROID_LOGGABLE_FLAG_NOT_WITHIN_SIGNAL) ? NULL : &sigflags);
+    pthread_mutex_unlock(&lock);
 
     switch (toupper(c)) {
     case 'V': return ANDROID_LOG_VERBOSE;
@@ -194,46 +168,36 @@
     case 'A': return ANDROID_LOG_FATAL;
     case 'S': return -1; /* ANDROID_LOG_SUPPRESS */
     }
-    return flag & ANDROID_LOGGABLE_FLAG_DEFAULT_MASK;
+    return def;
 }
 
-int __android_log_is_loggable(int prio, const char *tag, int flag)
+int __android_log_is_loggable(int prio, const char *tag, int def)
 {
-    int logLevel = __android_log_level(tag, flag);
+    int logLevel = __android_log_level(tag, def);
     return logLevel >= 0 && prio >= logLevel;
 }
 
-/*
- * Timestamp state generally remains constant, since a change is
- * rare, we can accept a trylock failure gracefully.
- */
-static pthread_mutex_t lock_timestamp = PTHREAD_MUTEX_INITIALIZER;
-
 char android_log_timestamp()
 {
     static struct cache r_time_cache = { NULL, -1, 0 };
     static struct cache p_time_cache = { NULL, -1, 0 };
+    static uint32_t serial;
+    uint32_t current_serial;
     char retval;
 
-    if (pthread_mutex_trylock(&lock_timestamp)) {
-        /* We are willing to accept some race in this context */
-        if (!(retval = p_time_cache.c)) {
-            retval = r_time_cache.c;
-        }
-    } else {
-        static uint32_t serial;
-        uint32_t current_serial = __system_property_area_serial();
-        if (current_serial != serial) {
-            refresh_cache(&r_time_cache, "ro.logd.timestamp");
-            refresh_cache(&p_time_cache, "persist.logd.timestamp");
-            serial = current_serial;
-        }
-        if (!(retval = p_time_cache.c)) {
-            retval = r_time_cache.c;
-        }
+    pthread_mutex_lock(&lock);
 
-        pthread_mutex_unlock(&lock_timestamp);
+    current_serial = __system_property_area_serial();
+    if (current_serial != serial) {
+        refresh_cache(&r_time_cache, "ro.logd.timestamp");
+        refresh_cache(&p_time_cache, "persist.logd.timestamp");
+        serial = current_serial;
     }
+    if (!(retval = p_time_cache.c)) {
+        retval = r_time_cache.c;
+    }
+
+    pthread_mutex_unlock(&lock);
 
     return tolower(retval ?: 'r');
 }
diff --git a/liblog/logd_write.c b/liblog/logd_write.c
index a8ecc8d..a4310ae 100644
--- a/liblog/logd_write.c
+++ b/liblog/logd_write.c
@@ -20,7 +20,6 @@
 #include <fcntl.h>
 #if !defined(_WIN32)
 #include <pthread.h>
-#include <signal.h>
 #endif
 #include <stdarg.h>
 #include <stdatomic.h>
@@ -55,43 +54,14 @@
 
 static int __write_to_log_init(log_id_t, struct iovec *vec, size_t nr);
 static int (*write_to_log)(log_id_t, struct iovec *vec, size_t nr) = __write_to_log_init;
+#if !defined(_WIN32)
+static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
+#endif
 
 #ifndef __unused
 #define __unused  __attribute__((__unused__))
 #endif
 
-#if !defined(_WIN32)
-static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
-
-static void lock(sigset_t *sigflags)
-{
-    /*
-     * If we trigger a signal handler in the middle of locked activity and the
-     * signal handler logs a message, we could get into a deadlock state.
-     */
-    sigset_t all;
-
-    sigfillset(&all);
-    pthread_sigmask(SIG_BLOCK, &all, sigflags);
-    pthread_mutex_lock(&log_init_lock);
-}
-
-static void unlock(sigset_t *sigflags)
-{
-    pthread_mutex_unlock(&log_init_lock);
-    pthread_sigmask(SIG_UNBLOCK, sigflags, NULL);
-}
-
-#define DECLARE_SIGSET(name) sigset_t name
-
-#else   /* !defined(_WIN32) */
-
-#define lock(sigflags) ((void)0)
-#define unlock(sigflags) ((void)0)
-#define DECLARE_SIGSET(name)
-
-#endif  /* !defined(_WIN32) */
-
 #if FAKE_LOG_DEVICE
 static int log_fds[(int)LOG_ID_MAX] = { -1, -1, -1, -1, -1 };
 #else
@@ -305,15 +275,17 @@
      */
     ret = TEMP_FAILURE_RETRY(writev(logd_fd, newVec + 1, i - 1));
     if (ret < 0) {
-        DECLARE_SIGSET(sigflags);
-
         ret = -errno;
         if (ret == -ENOTCONN) {
-            lock(&sigflags);
+#if !defined(_WIN32)
+            pthread_mutex_lock(&log_init_lock);
+#endif
             close(logd_fd);
             logd_fd = -1;
             ret = __write_to_log_initialize();
-            unlock(&sigflags);
+#if !defined(_WIN32)
+            pthread_mutex_unlock(&log_init_lock);
+#endif
 
             if (ret < 0) {
                 return ret;
@@ -357,16 +329,18 @@
 
 static int __write_to_log_init(log_id_t log_id, struct iovec *vec, size_t nr)
 {
-    DECLARE_SIGSET(sigflags);
-
-    lock(&sigflags);
+#if !defined(_WIN32)
+    pthread_mutex_lock(&log_init_lock);
+#endif
 
     if (write_to_log == __write_to_log_init) {
         int ret;
 
         ret = __write_to_log_initialize();
         if (ret < 0) {
-            unlock(&sigflags);
+#if !defined(_WIN32)
+            pthread_mutex_unlock(&log_init_lock);
+#endif
 #if (FAKE_LOG_DEVICE == 0)
             if (pstore_fd >= 0) {
                 __write_to_log_daemon(log_id, vec, nr);
@@ -378,7 +352,9 @@
         write_to_log = __write_to_log_daemon;
     }
 
-    unlock(&sigflags);
+#if !defined(_WIN32)
+    pthread_mutex_unlock(&log_init_lock);
+#endif
 
     return write_to_log(log_id, vec, nr);
 }
diff --git a/logd/LogBuffer.cpp b/logd/LogBuffer.cpp
index c2f71d1..fd5c066 100644
--- a/logd/LogBuffer.cpp
+++ b/logd/LogBuffer.cpp
@@ -191,9 +191,7 @@
         prio = *msg;
         tag = msg + 1;
     }
-    if (!__android_log_is_loggable(prio, tag,
-                                   ANDROID_LOG_VERBOSE |
-                                   ANDROID_LOGGABLE_FLAG_NOT_WITHIN_SIGNAL)) {
+    if (!__android_log_is_loggable(prio, tag, ANDROID_LOG_VERBOSE)) {
         // Log traffic received to total
         pthread_mutex_lock(&mLogElementsLock);
         stats.add(elem);
diff --git a/logd/LogBufferElement.cpp b/logd/LogBufferElement.cpp
index f10dccf..c4c302b 100644
--- a/logd/LogBufferElement.cpp
+++ b/logd/LogBufferElement.cpp
@@ -107,9 +107,7 @@
         LogBuffer *parent) {
     static const char tag[] = "chatty";
 
-    if (!__android_log_is_loggable(ANDROID_LOG_INFO, tag,
-                                   ANDROID_LOG_VERBOSE |
-                                   ANDROID_LOGGABLE_FLAG_NOT_WITHIN_SIGNAL)) {
+    if (!__android_log_is_loggable(ANDROID_LOG_INFO, tag, ANDROID_LOG_VERBOSE)) {
         return 0;
     }