In September 1927, César Vallejo tells Pablo Abril de Vivero on a letter: «Until now I live under a temporary parentheses, always on the doors of another kind of existence, one which, I repeat, it never comes. I take everything like this: with a provisional character». Beyond a biographical speculation, the letters reveal, from the poet’s voice, the labyrinths where he had to walk in Europe: financial trouble, illness, passion, projects, political thinking, description of geographical and historical contexts, success, and adversity. By researching and comparing Vallejo’s attitudes towards different individuals, and by analyzing the emotional situations and opinions that these documents evince, I will approach to the poet’s perspective and to his lyric voice, which —immerse in some of the most trascendental scenes of the twentieth century— reflects on the unfathomable human c...

The report addresses the management of parallel processes and synchronization in concurrent systems, highlighting common problems in accessing shared resources that affect efficiency and stability. It also highlights the need to optimize the management of large volumes of data and improve academic cooperation to develop advanced solutions.The objective of the study is to identify and analyze synchronization strategies that optimize parallel processes, evaluating their effectiveness in different scenarios and offering recommendations based on recent literature. A systematic review was conducted using the PRISMA methodology, selecting relevant articles published in the last five years and formulating key questions to guide the analysis. The results highlight that non-blocking strategies are more effective for managing shared resources, and techniques such as the use of mutex and actor mode...