[v3] Logging cleanup and per-thread logfiles

[PATCH v3 37/39] util/log: Rename QemuLogFile to RCUCloseFILE

Richard Henderson posted 39 patches 3 years, 9 months ago

Diff against v1 v1 v2
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Maintainers: Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Warner Losh <imp@bsdimp.com>, Kyle Evans <kevans@freebsd.org>, Eduardo Habkost <eduardo@habkost.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, "Philippe Mathieu-Daudé" <f4bug@amsat.org>, Yanan Wang <wangyanan55@huawei.com>, Pavel Pisa <pisa@cmp.felk.cvut.cz>, Vikram Garhwal <fnu.vikram@xilinx.com>, Jason Wang <jasowang@redhat.com>, Stefano Stabellini <sstabellini@kernel.org>, Anthony Perard <anthony.perard@citrix.com>, Paul Durrant <paul@xen.org>, Stefan Weil <sw@weilnetz.de>, Laurent Vivier <laurent@vivier.eu>, Markus Armbruster <armbru@redhat.com>, "Dr. David Alan Gilbert" <dgilbert@redhat.com>, Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, Eric Blake <eblake@redhat.com>, Vladimir Sementsov-Ogievskiy <v.sementsov-og@mail.ru>, Fam Zheng <fam@euphon.net>, Peter Maydell <peter.maydell@linaro.org>, Michael Rolnik <mrolnik@gmail.com>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, Taylor Simpson <tsimpson@quicinc.com>, Aurelien Jarno <aurelien@aurel32.net>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>, Chris Wulff <crwulff@gmail.com>, Marek Vasut <marex@denx.de>, Stafford Horne <shorne@gmail.com>, "Cédric Le Goater" <clg@kaod.org>, Daniel Henrique Barboza <danielhb413@gmail.com>, David Gibson <david@gibson.dropbear.id.au>, Greg Kurz <groug@kaod.org>, Palmer Dabbelt <palmer@dabbelt.com>, Alistair Francis <alistair.francis@wdc.com>, Bin Meng <bin.meng@windriver.com>, Yoshinori Sato <ysato@users.sourceforge.jp>, David Hildenbrand <david@redhat.com>, Cornelia Huck <cohuck@redhat.com>, Thomas Huth <thuth@redhat.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, Artyom Tarasenko <atar4qemu@gmail.com>, Bastian Koppelmann <kbastian@mail.uni-paderborn.de>, Max Filippov <jcmvbkbc@gmail.com>

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[PATCH v3 37/39] util/log: Rename QemuLogFile to RCUCloseFILE

Posted by Richard Henderson 3 years, 9 months ago

s/QemuLogFile/RCUCloseFILE/
s/qemu_logfile_free/rcu_close_file/

Emphasize that this is only a carrier for passing a pointer
to call_rcu for closing, and not the real logfile.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 util/log.c | 28 +++++++++++++---------------
 1 file changed, 13 insertions(+), 15 deletions(-)

diff --git a/util/log.c b/util/log.c
index 21da961d8d..eb6e85b2f0 100644
--- a/util/log.c
+++ b/util/log.c
@@ -29,15 +29,15 @@
 #include "qemu/rcu.h"
 
 
-typedef struct QemuLogFile {
+typedef struct RCUCloseFILE {
     struct rcu_head rcu;
     FILE *fd;
-} QemuLogFile;
+} RCUCloseFILE;
 
 /* Mutex covering the other global_* variables. */
 static QemuMutex global_mutex;
 static char *global_filename;
-static QemuLogFile *global_file;
+static RCUCloseFILE *global_file;
 
 int qemu_loglevel;
 static int log_append = 0;
@@ -52,7 +52,7 @@ bool qemu_log_enabled(void)
 /* Returns true if qemu_log() will write somewhere other than stderr. */
 bool qemu_log_separate(void)
 {
-    QemuLogFile *logfile;
+    RCUCloseFILE *logfile;
     bool res = false;
 
     rcu_read_lock();
@@ -68,7 +68,7 @@ bool qemu_log_separate(void)
 
 FILE *qemu_log_trylock(void)
 {
-    QemuLogFile *logfile;
+    RCUCloseFILE *logfile;
 
     rcu_read_lock();
     logfile = qatomic_rcu_read(&global_file);
@@ -108,14 +108,12 @@ static void __attribute__((__constructor__)) startup(void)
     qemu_mutex_init(&global_mutex);
 }
 
-static void qemu_logfile_free(QemuLogFile *logfile)
+static void rcu_close_file(RCUCloseFILE *r)
 {
-    g_assert(logfile);
-
-    if (logfile->fd != stderr) {
-        fclose(logfile->fd);
+    if (r->fd != stderr) {
+        fclose(r->fd);
     }
-    g_free(logfile);
+    g_free(r);
 }
 
 /* enable or disable low levels log */
@@ -124,7 +122,7 @@ static bool qemu_set_log_internal(const char *filename, bool changed_name,
 {
     bool need_to_open_file;
     bool daemonized;
-    QemuLogFile *logfile;
+    RCUCloseFILE *logfile;
 
     QEMU_LOCK_GUARD(&global_mutex);
     logfile = global_file;
@@ -178,7 +176,7 @@ static bool qemu_set_log_internal(const char *filename, bool changed_name,
 
     if (logfile && (!need_to_open_file || changed_name)) {
         qatomic_rcu_set(&global_file, NULL);
-        call_rcu(logfile, qemu_logfile_free, rcu);
+        call_rcu(logfile, rcu_close_file, rcu);
         logfile = NULL;
     }
 
@@ -196,7 +194,7 @@ static bool qemu_set_log_internal(const char *filename, bool changed_name,
             if (daemonized) {
                 dup2(fileno(fd), STDERR_FILENO);
                 fclose(fd);
-                /* This will skip closing logfile in qemu_logfile_free. */
+                /* This will skip closing logfile in rcu_close_file. */
                 fd = stderr;
             }
         } else {
@@ -207,7 +205,7 @@ static bool qemu_set_log_internal(const char *filename, bool changed_name,
 
         log_append = 1;
 
-        logfile = g_new0(QemuLogFile, 1);
+        logfile = g_new0(RCUCloseFILE, 1);
         logfile->fd = fd;
         qatomic_rcu_set(&global_file, logfile);
     }
-- 
2.25.1