diff --git a/xorriso/base_obj.c b/xorriso/base_obj.c
index 963563a9..fb08c9c3 100644
--- a/xorriso/base_obj.c
+++ b/xorriso/base_obj.c
@@ -320,6 +320,7 @@ int Xorriso_new(struct XorrisO ** xorriso,char *progname, int flag)
  }
  m->lib_msg_queue_lock_ini= 0;
  m->result_msglists_lock_ini= 0;
+ m->write_to_channel_lock_ini= 0;
  m->msglist_stackfill= 0;
  m->status_history_max= Xorriso_status_history_maX;
  m->scsi_log= 0;
@@ -330,6 +331,7 @@ int Xorriso_new(struct XorrisO ** xorriso,char *progname, int flag)
  Xorriso__text_to_sev(m->abort_on_text, &m->abort_on_severity, 0);
  m->abort_on_is_default= 1;
  m->problem_status= 0;
+ m->problem_status_lock_ini= 0;
  m->problem_status_text[0]= 0;
  m->errfile_log[0]= 0;
  m->errfile_mode= 0;
@@ -444,6 +446,14 @@ int Xorriso_new(struct XorrisO ** xorriso,char *progname, int flag)
  if(ret != 0)
    goto failure;
  m->result_msglists_lock_ini= 1;
+ ret= pthread_mutex_init(&(m->write_to_channel_lock), NULL);
+ if(ret != 0)
+   goto failure;
+ m->result_msglists_lock_ini= 1;
+ ret= pthread_mutex_init(&(m->problem_status_lock), NULL);
+ if(ret != 0)
+   goto failure;
+ m->problem_status_lock_ini= 1;
 
  if(leafname != NULL)
    free(leafname);
@@ -524,13 +534,18 @@ int Xorriso_destroy(struct XorrisO **xorriso, int flag)
  for(i= 0; i < Xorriso_max_appended_partitionS; i++)
    if(m->appended_partitions[i] != NULL)
      free(m->appended_partitions[i]);
+
+ Xorriso_detach_libraries(m, flag&1);
+
  if(m->lib_msg_queue_lock_ini)
    pthread_mutex_destroy(&(m->lib_msg_queue_lock));
  if(m->result_msglists_lock_ini)
    pthread_mutex_destroy(&(m->result_msglists_lock));
+ if(m->write_to_channel_lock_ini)
+   pthread_mutex_destroy(&(m->write_to_channel_lock));
+ if(m->problem_status_lock_ini)
+   pthread_mutex_destroy(&(m->problem_status_lock));
  
- Xorriso_detach_libraries(m, flag&1);
-
  free((char *) m);
  *xorriso= NULL;
  return(1);
diff --git a/xorriso/lib_mgt.c b/xorriso/lib_mgt.c
index 669d1dfd..22de6efd 100644
--- a/xorriso/lib_mgt.c
+++ b/xorriso/lib_mgt.c
@@ -470,8 +470,12 @@ cannot:;
 int Xorriso_process_msg_queues(struct XorrisO *xorriso, int flag)
 {
  int ret, error_code= 0, os_errno= 0, count= 0, pass, imgid, tunneled;
- int name_prefix_code, locked= 0, uret;
- char severity[80];
+ int name_prefix_code;
+ char severity[80], *text= NULL;
+
+#ifdef Xorriso_fetch_with_msg_queueS
+ int locked= 0, uret;
+#endif
 
 #ifdef Xorriso_with_libjtE
  char *msg;
@@ -481,26 +485,35 @@ int Xorriso_process_msg_queues(struct XorrisO *xorriso, int flag)
    ret= 1; goto ex;
  }
 
+#ifdef Xorriso_fetch_with_msg_queueS
+
+ Xorriso_alloc_meM(text, char, sizeof(xorriso->info_text));
+
  ret= pthread_mutex_lock(&(xorriso->lib_msg_queue_lock));
  if(ret != 0) {
    Xorriso_msgs_submit(xorriso, 0,
               "Cannot aquire mutex lock for processing library message queues",
-               errno, "FATAL", 0);
-   ret= -1; goto ex;
- }
- locked= 1;
+               ret, "FATAL", 0);
+ } else
+   locked= 1;
+
+#else /* Xorriso_fetch_with_msg_queueS */
+
+ text= xorriso->info_text;
+
+#endif /* ! Xorriso_fetch_with_msg_queueS */
+
 
  for(pass= 0; pass< 3; pass++) {
    while(1) {
      tunneled= 0;
      if(pass==0) {
-
        ret= 0;
 #ifdef Xorriso_with_libjtE
        if(xorriso->libjte_handle != NULL) {
          msg= libjte_get_next_message(xorriso->libjte_handle);
          if(msg != NULL) {
-           sprintf(xorriso->info_text, "%1.4095s", msg);
+           sprintf(text, "%1.4095s", msg);
            free(msg);
            strcpy(severity, "NOTE");
            error_code= 0;
@@ -511,11 +524,9 @@ int Xorriso_process_msg_queues(struct XorrisO *xorriso, int flag)
 #endif /* Xorriso_with_libjtE */
 
      } else if(pass==1)
-       ret= iso_obtain_msgs("ALL", &error_code, &imgid,
-                            xorriso->info_text, severity);
+       ret= iso_obtain_msgs("ALL", &error_code, &imgid, text, severity);
      else {
-       ret= burn_msgs_obtain("ALL", &error_code, xorriso->info_text, &os_errno,
-                             severity);
+       ret= burn_msgs_obtain("ALL", &error_code, text, &os_errno, severity);
        if((error_code>=0x00030000 && error_code<0x00040000) ||
           (error_code>=0x00050000 && error_code<0x00060000))
          tunneled= -1; /* "libisofs:" */
@@ -538,28 +549,44 @@ int Xorriso_process_msg_queues(struct XorrisO *xorriso, int flag)
        name_prefix_code= 0;
      else
        name_prefix_code= pass + tunneled;
-     Xorriso_msgs_submit(xorriso, error_code, xorriso->info_text, os_errno, 
+     Xorriso_msgs_submit(xorriso, error_code, text, os_errno, 
                          severity, name_prefix_code << 2);
      count++;
    }
  }
  if(xorriso->library_msg_direct_print && count>0) {
-   sprintf(xorriso->info_text,"   (%d library messages repeated by xorriso)\n",
-           count);
+   sprintf(text,"   (%d library messages repeated by xorriso)\n", count);
+
+#ifdef Xorriso_fetch_with_msg_queueS
+
+   Xorriso_msgs_submit(xorriso, 0, text, 0, "NOTE", 256);
+
+#else /* Xorriso_fetch_with_msg_queueS */
+
    Xorriso_info(xorriso, 0);
+
+#endif /* Xorriso_fetch_with_msg_queueS */
+
  }
  ret= 1;
 ex:;
+
+#ifdef Xorriso_fetch_with_msg_queueS
+
  if(locked) {
    uret= pthread_mutex_unlock(&(xorriso->lib_msg_queue_lock));
    if(uret != 0) {
      Xorriso_msgs_submit(xorriso, 0,
              "Cannot release mutex lock for processing library message queues",
-              errno, "FATAL", 0);
+              uret, "FATAL", 0);
      ret= -1;
    }
  }
- return(1);
+ Xorriso_free_meM(text);
+
+#endif /* Xorriso_fetch_with_msg_queueS */
+
+ return(ret);
 }
 
 
diff --git a/xorriso/parse_exec.c b/xorriso/parse_exec.c
index b29a956f..6bdee93f 100644
--- a/xorriso/parse_exec.c
+++ b/xorriso/parse_exec.c
@@ -30,12 +30,16 @@
 #include <sys/wait.h>
 
 
-
 #include "xorriso.h"
 #include "xorriso_private.h"
 #include "xorrisoburn.h"
 
 
+#ifdef Xorriso_fetch_with_msg_queueS
+#include <pthread.h>
+#endif
+
+
 /* @param flag bit0= do not warn of wildcards
                bit1= these are disk_paths
 */
@@ -207,17 +211,55 @@ int Xorriso_set_problem_status(struct XorrisO *xorriso, char *severity,
  char *sev_text= "ALL";
  int sev, ret;
 
+#ifdef Xorriso_fetch_with_msg_queueS
+ int locked= 0, uret;
+ static int complaints= 0, complaint_limit= 5;
+#endif
+
  if(severity[0])
    sev_text= severity;
  ret= Xorriso__text_to_sev(sev_text, &sev, 0);
  if(ret<=0)
    return(0);
+
+#ifdef Xorriso_fetch_with_msg_queueS
+
+ ret= pthread_mutex_lock(&(xorriso->problem_status_lock));
+ if(ret != 0) {
+   /* Cannot report failure through the failing message output system */
+   complaints++;
+   if(complaints < complaint_limit)
+     fprintf(stderr,
+        "xorriso : pthread_mutex_lock() for problem_status returns %d\n",
+        ret);
+ } else
+   locked= 1;
+
+#endif /* Xorriso_fetch_with_msg_queueS */
+
  xorriso->problem_status= sev;
  strcpy(xorriso->problem_status_text, sev_text);
  if(sev > xorriso->eternal_problem_status) {
    xorriso->eternal_problem_status= sev;
    strcpy(xorriso->eternal_problem_status_text, sev_text);
  }
+
+#ifdef Xorriso_fetch_with_msg_queueS
+
+ if(locked) {
+   uret= pthread_mutex_unlock(&(xorriso->problem_status_lock));
+   if(uret != 0) {
+     /* Cannot report failure through the failing message output system */
+     complaints++;
+     if(complaints < complaint_limit)
+       fprintf(stderr,
+            "xorriso : pthread_mutex_unlock() for problem_status returns %d\n",
+            uret);
+   }
+ }
+
+#endif /* Xorriso_fetch_with_msg_queueS */
+
  return(1);
 }
 
diff --git a/xorriso/text_io.c b/xorriso/text_io.c
index 8be54ad2..473d0ec4 100644
--- a/xorriso/text_io.c
+++ b/xorriso/text_io.c
@@ -564,12 +564,12 @@ static int Xorriso_write_to_msglist(struct XorrisO *xorriso,
                                     struct Xorriso_lsT **xorriso_msglist,
                                     char *text, int flag)
 {
- int ret;
+ int ret, locked= 0;
  struct Xorriso_lsT *msglist;
 
  ret= Xorriso_lock_outlists(xorriso, 0);
- if(ret <= 0)
-   return(-1);
+ if(ret > 0)
+   locked= 1;
  msglist= *xorriso_msglist;
  ret= Xorriso_lst_append_binary(&msglist, text, strlen(text) + 1, 0);
  if(ret <= 0) {
@@ -579,7 +579,8 @@ static int Xorriso_write_to_msglist(struct XorrisO *xorriso,
    *xorriso_msglist= msglist;
  ret= 1;
 ex:;
- Xorriso_unlock_outlists(xorriso, 0);
+ if(locked)
+   Xorriso_unlock_outlists(xorriso, 0);
  return(ret);
 }
 
@@ -601,11 +602,30 @@ bit15= with bit1 to bit3: close depicted log file
  static int num_channels= 4;
  static char channel_prefixes[4][4]= {".","R","I","M"};
 
+#ifdef Xorriso_fetch_with_msg_queueS
+ static int complaints= 0, complaint_limit= 5;
+ int locked= 0, uret;
+#endif
+
  text= in_text; /* might change due to backslash encoding */
 
  if(channel_no<0 || channel_no>=num_channels)
    {ret= -1; goto ex;}
 
+#ifdef Xorriso_fetch_with_msg_queueS
+ ret= pthread_mutex_lock(&(xorriso->write_to_channel_lock));
+ if(ret != 0) {
+   /* Cannot report failure through the failing message output system */
+   complaints++;
+   if(complaints <= complaint_limit)
+     fprintf(stderr,
+           "xorriso : pthread_mutex_lock() for write_to_channel returns %d\n",
+           ret);
+   /* Intentionally not aborting here */;
+ } else
+   locked= 1;
+#endif /* Xorriso_fetch_with_msg_queueS */
+
  /* Logfiles */
  logfile_fp= xorriso->logfile_fp[channel_no];
  pktlog_fp= xorriso->pktlog_fp;
@@ -772,6 +792,23 @@ bit15= with bit1 to bit3: close depicted log file
 ex:
  if(text != in_text && text != NULL)
    free(text);
+
+#ifdef Xorriso_fetch_with_msg_queueS
+
+ if(locked) {
+   uret= pthread_mutex_unlock(&(xorriso->write_to_channel_lock));
+   if(uret != 0) {
+     /* Cannot report failure through the failing message output system */
+     complaints++;
+     if(complaints <= complaint_limit)
+       fprintf(stderr,
+          "xorriso : pthread_mutex_unlock() for write_to_channel returns %d\n",
+          uret);
+   }
+ }
+
+#endif /* Xorriso_fetch_with_msg_queueS */
+
  return(ret);
 }
 
@@ -782,10 +819,8 @@ int Xorriso_push_outlists(struct XorrisO *xorriso, int *stack_handle,
  int ret, locked= 0;
 
  ret= Xorriso_lock_outlists(xorriso, 0);
- if(ret != 0)
-   {ret= -1; goto ex;}
- locked= 1;
-
+ if(ret > 0)
+   locked= 1;
  if(xorriso->msglist_stackfill + 1 >= Xorriso_max_outlist_stacK) {
    Xorriso_msgs_submit(xorriso, 0,
                 "Overflow of message output redirection stack", 0, "FATAL", 0);
@@ -832,9 +867,8 @@ int Xorriso_fetch_outlists(struct XorrisO *xorriso, int stack_handle,
    flag|= 3;
 
  ret= Xorriso_lock_outlists(xorriso, 0);
- if(ret != 0)
-   {ret= -1; goto ex;}
- locked= 1;
+ if(ret > 0)
+   locked= 1;
 
  if(stack_handle == -1)
    stack_handle= xorriso->msglist_stackfill - 1;
@@ -869,9 +903,8 @@ int Xorriso_pull_outlists(struct XorrisO *xorriso, int stack_handle,
  int i, ret, locked= 0;
 
  ret= Xorriso_lock_outlists(xorriso, 0);
- if(ret != 0)
-   {ret= -1; goto ex;}
- locked= 1;
+ if(ret > 0)
+   locked= 1;
 
  if(stack_handle < 0 || stack_handle >= xorriso->msglist_stackfill) {
    Xorriso_msgs_submit(xorriso, 0,
@@ -1042,7 +1075,11 @@ int Xorriso_process_errfile(struct XorrisO *xorriso,
 }
 
 
+#ifdef Xorriso_fetch_with_msg_queueS
+/* Important: This function must stay thread-safe with all use of xorriso. */
+#else
 /* Note: It is ok to submit xorriso->info_text as msg_text here. */
+#endif
 /* flag: 
      bit0= for Xorriso_info() : use pager (as with result)
      bit1= for Xorriso_info() : permission to suppress output
@@ -1054,13 +1091,14 @@ int Xorriso_process_errfile(struct XorrisO *xorriso,
        else: ""
      bit6= append carriage return rather than line feed (if not os_errno)
      bit7= perform Xorriso_process_msg_queues() first
+     bit8= do not prepend name prefix and severity
 */
 int Xorriso_msgs_submit(struct XorrisO *xorriso, 
                         int error_code, char msg_text[], int os_errno,
                         char severity[], int flag)
 {
  int ret, lt, li, sev, i;
- char *sev_text= "FATAL", prefix[80];
+ char *sev_text= "FATAL", prefix[80], *text= NULL;
  static char pfx_list[20][16]= {
                    "xorriso : ", "libisofs: ", "libburn : ", "libisoburn: ",
                     "", "", "", "", "", "", "", "", "", "", "", "" };
@@ -1077,45 +1115,70 @@ int Xorriso_msgs_submit(struct XorrisO *xorriso,
    Xorriso__text_to_sev(sev_text, &sev, 0);
  else
    sev_text= severity;
- if(xorriso->problem_status<sev) {
-   xorriso->problem_status= sev;
-   strcpy(xorriso->problem_status_text, sev_text);
- }
- if(xorriso->eternal_problem_status<sev) {
-   xorriso->eternal_problem_status= sev;
-   strcpy(xorriso->eternal_problem_status_text, sev_text);
- }
+ if(xorriso->problem_status<sev)
+   Xorriso_set_problem_status(xorriso, sev_text, 0);
 
  /* Report problem event */
  if(sev<xorriso->report_about_severity && sev<xorriso->abort_on_severity)
-   return(2);
- sprintf(prefix,"%s%s : ", pfx_list[(flag>>2)&15], sev_text);
- li= strlen(prefix);
+   {ret= 2; goto ex;}
  lt= strlen(msg_text);
+ if(!(flag & 256)) {
+   sprintf(prefix,"%s%s : ", pfx_list[(flag>>2)&15], sev_text);
+   li= strlen(prefix);
+ } else {
+   prefix[0]= 0;
+   li= 0;
+ }
  if(lt > ((int) sizeof(xorriso->info_text)) - li - 2)
    lt= sizeof(xorriso->info_text)-li-2;
- if(msg_text==xorriso->info_text) {
-   for(i= lt; i>=0; i--)
-     msg_text[i+li]= msg_text[i];
-   for(i=0; i<li; i++)
-     msg_text[i]= prefix[i];
+
+#ifdef Xorriso_fetch_with_msg_queueS
+
+ Xorriso_alloc_meM(text, char, sizeof(xorriso->info_text));
+
+#else /* Xorriso_fetch_with_msg_queueS */
+
+ text= xorriso->info_text;
+
+#endif /* ! Xorriso_fetch_with_msg_queueS */
+
+ if(msg_text == text) {
+   if(li > 0) {
+     for(i= lt; i>=0; i--)
+       msg_text[i+li]= msg_text[i];
+     for(i=0; i<li; i++)
+       msg_text[i]= prefix[i];
+   }
  } else {
-   strcpy(xorriso->info_text, prefix);
-   strncpy(xorriso->info_text+li, msg_text, lt);
+   if(li > 0)
+     strcpy(text, prefix);
+   strncpy(text + li, msg_text, lt);
  }
  if((flag&64) && os_errno<=0)
-   xorriso->info_text[li+lt]= '\r';
+   text[li+lt]= '\r';
  else
-   xorriso->info_text[li+lt]= '\n';
- xorriso->info_text[li+lt+1]= 0;
+   text[li+lt]= '\n';
+ text[li+lt+1]= 0;
+ if(os_errno>0)
+   sprintf(text + strlen(text) - 1, " : %s\n", strerror(os_errno));
+
+#ifdef Xorriso_fetch_with_msg_queueS
+
+ Xorriso_write_to_channel(xorriso, text, 2, 0);
+
+#else /* Xorriso_fetch_with_msg_queueS */
 
- if(os_errno>0) {
-   sprintf(xorriso->info_text + strlen(xorriso->info_text) - 1,
-           " : %s\n", strerror(os_errno));
- }
  Xorriso_info(xorriso,4|(flag&3));
 
- return(1);   
+#endif /* ! Xorriso_fetch_with_msg_queueS */
+
+ex:;
+
+#ifdef Xorriso_fetch_with_msg_queueS
+ Xorriso_free_meM(text);
+#endif /* ! Xorriso_fetch_with_msg_queueS */
+
+ return(ret);
 }
 
 
diff --git a/xorriso/xorriso_private.h b/xorriso/xorriso_private.h
index 84adab58..d71e9941 100644
--- a/xorriso/xorriso_private.h
+++ b/xorriso/xorriso_private.h
@@ -19,6 +19,12 @@
 #define Xorriso_private_includeD yes
 
 
+/* <<< Disable this to disable pthread_mutex locking on message and result
+       output.
+*/
+#define Xorriso_fetch_with_msg_queueS yes
+
+
 /* for uint32_t */
 #ifdef HAVE_STDINT_H
 #include <stdint.h>
@@ -566,6 +572,9 @@ struct XorrisO { /* the global context of xorriso */
  pthread_mutex_t lib_msg_queue_lock;
  pthread_mutex_t result_msglists_lock;
 
+ int write_to_channel_lock_ini;
+ pthread_mutex_t write_to_channel_lock;
+
  int status_history_max; /* for -status long_history */
  
  /* 0= no logging of SCSI commands, 1= to stderr */
@@ -579,6 +588,8 @@ struct XorrisO { /* the global context of xorriso */
  int abort_on_is_default; /* will be set to 0 by first -abort_on */
  int problem_status; /* Severity rank number. 0= no abort condition present */
  char problem_status_text[20];
+ int problem_status_lock_ini;
+ pthread_mutex_t problem_status_lock;
 
  char errfile_log[SfileadrL]; /* for -errfile_log */
  int errfile_mode; /* bit0= marked */
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index 201373bd..78082adb 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2012.09.11.122559"
+#define Xorriso_timestamP "2012.09.13.130910"